JP3667587B2 - Noble gas discharge lamp and method for manufacturing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rare gas discharge lamp, and more particularly to a rare gas discharge lamp in which a light emitting layer having an aperture portion is formed on the inner surface of a glass bulb and a pair of strip-shaped external electrodes are disposed on an outer peripheral surface. The present invention relates to the improvement of starting characteristics in an environment where the extraneous light is poor.
[0002]
[Prior art]
The present applicant has previously proposed a rare gas discharge lamp L shown in FIGS. In the figure, reference numeral 1 denotes a straight tube envelope that is hermetically sealed with, for example, a glass bulb, and has one or more kinds of fluorescent light such as a rare earth phosphor and a halophosphate phosphor on the inner surface thereof. A light emitting layer 2 including a body is formed. In particular, the light emitting layer 2 is formed with an aperture portion (a non-formed portion of the light emitting layer 2) 2a having a predetermined opening angle over almost the entire length. The sealing structure of the envelope 1 is constituted by a so-called top seal that heats a predetermined portion of the glass bulb, heats it, melts it, and seals it. The sealing glass plate can be sealed.
[0003]
Note that a predetermined amount of rare gas such as xenon, krypton, neon, and helium that does not contain metal vapor such as mercury is sealed in the inner space of the envelope 1 in a single or mixed amount. It is desirable to enclose a rare gas.
[0004]
The sheet structure 3 is wound around the outer peripheral surface of the envelope 1 so as to be in close contact therewith. The sheet structure 3 is, for example, an insulating translucent sheet 4 having a length substantially the same as the entire length of the envelope 1 and a predetermined distance from each other on one surface of the translucent sheet 4. A pair of strip-like external electrodes 5 and 6 made of a bonded metal member, terminals 51 and 61 led out from the ends of the external electrodes 5 and 6, and formed on one surface of the translucent sheet 4. And an adhesive layer 9 formed.
[0005]
In particular, when the seat structure 3 is attached to the envelope 1, the first opening 7 is formed between the one ends 5 a and 6 a of the external electrodes 5 and 6, and the other ends 5 b and 6 b of the external electrodes 5 and 6. A second opening 8 is formed between them, and light from the light emitting layer 2 is emitted to the outside mainly from the aperture 2 a through the first opening 7. And in the 2nd opening part 8, after bonding the other edge part 4b on the one edge part 4a of the translucent sheet | seat 4, it has adhere | attached. In this sheet structure 3, the translucent sheet 4 is preferably, for example, a polyethylene terephthalate (PET) resin, but other resins such as a polyester resin can also be used. The external electrodes 5 and 6 are preferably made of, for example, an aluminum foil, but other metal members such as nickel and silver can be used as long as the metal members have excellent conductivity. Furthermore, a silicone-based adhesive is suitable as the adhesive layer 9, but other adhesives such as an acrylic adhesive can also be used.
[0006]
For example, the rare gas discharge lamp L is manufactured as follows. First, for example, a phosphor coating solution containing a phosphor having an emission spectrum in each of a blue region, a green region, and a red region is applied to the inner surface of the envelope 1 made of a glass bulb, dried, and baked to form the light emitting layer 2. It is formed. Next, the aperture portion 2a is formed by forcibly peeling and removing a part of the light emitting layer 2 at a predetermined opening angle using a scraper (not shown). Next, the envelope 1 is configured to be hermetically sealed, and a predetermined amount of a rare gas such as xenon is sealed in the internal space.
[0007]
Next, as shown in FIGS. 15 to 16, a pair of external electrodes 5, 6 are arranged apart from each other in a predetermined portion of the translucent sheet 4, and terminals 51, 61 are arranged from the ends of the external electrodes 5, 6. And the adhesive layer 9 is formed on the translucent sheet 4 and the external electrodes 5 and 6 to form the sheet structure 3. Next, as shown in FIG. 17, for example, the seat structure 3 is placed on the assembly stage 10 in a developed state. Subsequently, the envelope 1 is positioned on the one end 4a of the translucent sheet 4 of the sheet structure 3 so that the longitudinal direction of the envelope 1 is along the longitudinal direction of the external electrodes 5 and 6 (in parallel). . In this state, the driven rollers 11 and 11 are arranged so that the envelope 1 is slightly pressed against the translucent sheet 4. In this state, the stage 10 is slightly moved in the M direction and then moved in the N direction. As a result, as shown in FIG. 14, the sheet structure 3 is wound around the outer peripheral surface of the envelope 1, and the other end 4 b is superimposed on one end 4 a of the translucent sheet 4. Thus, the rare gas discharge lamp L is completed.
[0008]
The rare gas discharge lamp L is turned on by, for example, a lighting device shown in FIG. The lighting device (high frequency voltage generation circuit) HA includes an output transformer TRA having a primary coil TRa and a secondary coil TRb, and a switching element such as a field effect transistor (FET) connected in series to the primary coil TRa of the output transformer TRA. QA, a drive circuit PD for applying a rectangular wave drive signal to the gate of the switching element QA, and a capacitor CA connected in parallel to the series circuit of the primary coil TRa of the output transformer TRA and the switching element QA Has been. A rare gas discharge lamp L is connected to the output side of the high frequency voltage generation circuit HA so that a pulsed high frequency high voltage is applied to the external electrodes 5 and 6 thereof.
[0009]
This lighting device operates as follows. First, when the DC power supply EB is connected to the input side of the high-frequency voltage generation circuit HA, the capacitor CA is charged. In this state, when the drive signal shown in FIG. 19 (a) is applied from the drive circuit PD to the gate of the switching element QA, the switching element QA has a time t as shown in FIG. 20 (b) and FIG. 20 (a).₁, T₂, T_ThreeTurns on and off with. Switching element QA is at time t₁When turned on, a coil current Ic flows through the primary coil TRa of the output transformer TRA as shown in FIG. 19C, and electromagnetic energy is accumulated in the primary coil TRa of the output transformer TRA. Next, the switching element QA is at time t₂
In the OFF state, a pulsed high-frequency voltage is generated in the secondary coil TRb of the output transformer TRA based on the action of the accumulated electromagnetic energy due to the winding ratio between the primary coil TRa and the secondary coil TRb. Applied to the external electrodes 5 and 6 of the gas discharge lamp L, the rare gas discharge lamp L is turned on. When the rare gas discharge lamp L is turned on, a lamp current Ib flows through the rare gas discharge lamp L as shown in FIGS. 19 (d) and 20 (b). The lamp current Ib flows in the periods T1 and T2 of each one cycle T in the repetition period, and in the period T2, the charge accumulated in the rare gas discharge lamp L flows as a lamp current in a direction opposite to the direction of the period T1. This period T2 is referred to as a bounce period for convenience. During this rebound period T2 (eg, time t_Three) Is given a drive signal to the switching element QA, as shown in FIG._Three, A pulsed current flows through the coil current Ic. In relation to this current, a lamp current Ibj indicated by hatching in FIG. 20D and FIG. 20B flows in the lamp current Ib while being superimposed on the lamp current flowing in the period T2. If the timing of applying the drive signal to the switching element QA is delayed outside the range of the rebound period T2, the lamp current Ib is simply damped and the lamp current Ibj indicated by the diagonal lines does not flow. As a result, the rare gas discharge lamp L emits light (φ) as shown in FIG. 19 (e), and the brightness φ is increased as shown by the hatched line (φj) in the same figure as the lamp current Ibj increases. The
[0010]
According to this lighting device, in the lighting state of the rare gas discharge lamp L, after the switching element QA is turned off, the switching element QA is turned on during the rebound period T2 in which the direction of the lamp current Ib is reversed. Even if the input current of the circuit HA is not further increased, the lamp current Ib can be increased by Ibj in the rebound period T2, and the brightness can be increased accordingly. In addition, the amount of light can be further increased by pulsing the high-frequency voltage applied to the rare gas discharge lamp L. Therefore, when applied to a document irradiation reading apparatus of an OA device, the document surface illuminance can be increased, and the reading quality and the like can be improved.
[0011]
In particular, since no mercury is used in the rare gas discharge lamp L, the amount of light rises sharply after lighting, and the amount of light reaches almost 100% simultaneously with lighting. For this reason, it is suitable as a light source for reading a document in OA equipment such as a facsimile, an image scanner, and a copying machine.
[0012]
If the above-described method is adopted for the assembly of the rare gas discharge lamp, the adhesive layer 9 is formed on one surface of the translucent sheet 4, so that the envelope 1 is placed on the sheet structure 3. Since the sheet structure 3 can be wound and closely attached to the outer peripheral surface of the envelope 1 by a simple operation that only rolls, not only can the work efficiency be remarkably improved, but also mechanization is possible and mass productivity can be increased. Excellent effects can be expected.
[0013]
[Problems to be solved by the invention]
By the way, when such a rare gas discharge lamp L is applied to a document irradiation reading apparatus in an OA apparatus, the above excellent effect can be expected, which is desirable.
Recently, it has been applied to various types of document irradiation reading devices.
[0014]
However, recently, the document irradiation / reading apparatus tends to be configured in a sealed structure in connection with downsizing of the OA equipment. In such a case, the rare gas discharge lamp L is hardly irradiated with external light. There is almost no darkness. Therefore, in the presence of extraneous light, the rare gas discharge lamp L is incorporated in the lighting device shown in FIG. 18, for example, the frequency is 25 KHz and the voltage is 2500 V._OPIf a pulsed high frequency voltage is applied to the external electrodes 5 and 6, the light is lit at about 1500 to 2000 mS (milliseconds) or less after the voltage is applied, but in such a dark state, only 5000 to 6000 mS or more is required for lighting. In addition, the lighting time variation becomes extremely large, for example, some of them do not light up at all. For this reason, sometimes the use of OA equipment may be hindered.
[0015]
The cause is considered as follows. That is, in general, when a fluorescent lamp is started, if the initial electrons are not present, ionization is not smoothly performed, so that it is difficult or difficult to start. Usually, the initial electrons that trigger the discharge include thermionic electrons, photoelectrons, electrons emitted by a high electric field, and natural cosmic rays. However, for example, when the rare gas discharge lamp DL is arranged at a location completely cut off from the outside like the above-mentioned OA equipment, natural cosmic rays do not reach the rare gas discharge lamp DL, and the initial electrons are You can't expect. Therefore, this kind of rare gas discharge lamp has problems that the starting characteristics become unstable and the variation in lighting time increases.
[0016]
  Therefore, an object of the present invention is to provide a rare gas discharge lamp that can easily improve the starting characteristics in a dark state with a relatively simple configuration.And manufacturing method thereofIs to provide.
[0017]
[Means for Solving the Problems]
  Therefore, the present inventionNoble gas discharge lampIn order to achieve the above object, an envelope having a light emitting layer on the inner surface and enclosing a rare gas in the inner space;
  A pair of band-shaped external electrodes made of metal members arranged on the outer peripheral surface of the envelope so as to be separated from each other so that the first and second openings are formed in the longitudinal direction portion excluding the end thereof;
  The light emitting layer is formed without facing the external electrodeOn the inner surface of the envelope corresponding to the end of the envelope that is not, The entire circumference of the envelopeAnd a conductive member formed on the substrate.
[0018]
  In addition, the present inventionNoble gas discharge lampAn envelope having a light emitting layer on the inner surface and enclosing a rare gas in the internal space;
  A pair of band-shaped external electrodes made of metal members arranged on the outer peripheral surface of the envelope so as to be separated from each other so that the first and second openings are formed in the longitudinal direction portion excluding the end thereof;
  The light emitting layer is formed without facing the external electrodeOn the inner surface of the envelope corresponding to the end of the envelope that is not, The entire circumference of the envelopeAnd a translucent insulating member mounted on the outer peripheral surface of the envelope so as to be covered with the external electrode.To do.Insulating materialIsConstructed with protective tube made of translucent sheet or heat shrinkable resinMay.
[0019]
  In addition, the present inventionNoble gas discharge lampHas a light emitting layer on the inner surface and encloses a rare gas in the internal space.RuAn envelope,
  A pair of belt-like external electrodes made of a metal member having a length shorter than the full length of the envelope are provided on one surface of the translucent sheet having a length substantially the same as the full length of the envelope. A sheet structure which is arranged so as to be spaced apart from each other so as to form an opening, and is formed by forming an adhesive layer on the translucent sheet surface on the side where the external electrode is located and the external electrode surface;,
  A conductive member formed on the entire circumference of the envelope in the envelope inner surface corresponding to an end of the envelope not facing the external electrode and not having the light emitting layer formed thereon;Comprising
  A sheet structure on the outer peripheral surface of the envelope,SaidWith the envelopeSaidWrap so that the external electrode is located between the translucent sheetTheIt is characterized by that.
[0020]
  In the rare gas discharge lamp of the present invention,The conductive member is carbon, silver, zinc oxide, aluminum, tin oxide, indium oxide, barium, nickel or a substance containing these.May.
[0021]
  Furthermore, the present invention providesForming a light emitting layer on the inner surface of the tubular envelope;
  Forming a conductive member on the entire circumference of the envelope in an end portion of the inner surface of the envelope where the light emitting layer is not formed;
  Sealing the envelope in which the conductive member is formed in a state in which a rare gas is sealed therein;
  Forming an external electrode on the outer peripheral surface of the envelope, and
  The step of forming the conductive member includes
  Applying a solution containing the conductive member to the ring member;
  The ring member coated with the solution is inserted into the envelope, and the envelope is rotated while the ring member is in contact with the inner surface of the envelope at the end of the envelope. And a step of transferring the solution to the inner surface of the envelope, thereby providing a method for manufacturing a rare gas discharge lamp.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Next, a first embodiment of a rare gas discharge lamp according to the present invention will be described with reference to FIGS. The same parts as those of the prior art shown in FIGS. 14 to 16 are denoted by the same reference numerals, and detailed description thereof is omitted. In this figure, the characteristic part of this embodiment is that a pair of strip-like external electrodes 5 and 6 made of a metal member are provided on the outer peripheral surface of the envelope 1 and the longitudinal direction portion excluding the end 1a of the envelope 1 1 and 2 which are spaced apart from each other so that the second openings 7 and 8 are formed, and the envelope 1 in which the external electrodes 5 and 6 are not disposed and the light emitting layer 2 is not formed. The conductive member CS is formed in a substantially endless ring shape on the inner surface of the envelope corresponding to the end portion 1a.
[0023]
In this rare gas discharge lamp DL, as a constituent member of the envelope 1, for example, the volume resistivity at 150 ° C. is 1 × 10 5.⁹A borosilicate glass system (hereinafter referred to as BFK glass for the sake of convenience) which is Ωcm or more and does not contain lead composed mainly of silicon oxide and boron oxide is suitable. This BFK glass is composed of, for example, silicon oxide (67.6%), alumina (4%), boron oxide (18%), sodium oxide (1%), potassium oxide (8%), lithium oxide (1%), oxidation It is made of titanium (0.4%) or the like. In addition, lead glass, soda glass, barium glass, and the like can be applied. This barium glass is made of, for example, oxides such as silicic acid, alumina, boric acid, potassium, barium, and calcium. The thickness of these glasses is set to 0.2 to 0.7 mm (preferably 0.4 to 0.7 mm). However, when the wall thickness is less than 0.4 mm, particularly less than 0.2 mm, the mechanical strength of the envelope 1 is extremely reduced, and the defect rate associated with glass breakage in the production process by the mass production equipment increases. On the contrary, when the thickness exceeds 0.7 mm, the striped discharge state is visually observed, and flickering may occur in the light emitted from the aperture portion 2a. Therefore, it is desirable to set the thickness of the envelope 1 within the above range. In addition, it can be used outside the above range depending on the application.
[0024]
Further, a rare gas mainly composed of xenon gas is sealed in the inner space of the envelope 1, and the sealing pressure is set in a range of 83 to 200 torr, for example. In this range, in the presence of extraneous light, an improvement effect with respect to starting characteristics, light output, and flicker can be obtained. However, when the sealing pressure is less than 83 Torr, the improvement effect on the light output becomes insufficient. Conversely, when the sealing pressure exceeds 200 Torr, not only the starting characteristics are impaired, but also the striped discharge state is There is a case where flickering occurs in the light that is visually observed and emitted from the aperture portion 2a. Therefore, it is desirable to set the rare gas filling pressure within the above range. In addition, it can be used outside the above range depending on the application.
[0025]
The light emitting layer 2 is formed on the inner surface of the envelope 1 over almost the entire length except for its end portions 1a and 1b. In particular, the light emitting layer 2 may be composed of only one type of phosphor to be used or a mixture of two or more types depending on the use of the rare gas discharge lamp. For example, in the case of a three-wavelength emission type, for example, europium-activated barium magnesium aluminate phosphor having an emission spectrum in the blue region, cerium / terbium-activated lanthanum phosphate phosphor having an emission spectrum in the green region, red region It is made of a mixed phosphor formed by mixing europium-activated yttrium borate / gadolinium phosphor having an emission spectrum, and its adhesion amount is 1 cm.²The range is set to 5 to 30 mg per unit. In this range, a sufficient amount of light can be obtained. However, if the amount of adhesion is less than 5 mg, the amount of light is insufficient. Conversely, if the amount of adhesion exceeds 30 mg, it is difficult to form a homogeneous light-emitting layer. Therefore, it is desirable to set the amount of the light emitting layer 2 to be within the above range.
[0026]
Further, the external electrodes 5 and 6 are made of a metal member having excellent conductivity, and are arranged in a belt-like state on the outer peripheral surface of the envelope 1. In particular, when the seat structure 3 is wound and mounted on the outer peripheral surface of the envelope 1, the external electrodes 5 and 6 are disposed on the outer peripheral surface of the envelope 1 over almost the entire length except for the end portions 1a and 1b thereof. Arranged. That is, it is disposed on the outer peripheral surface of the envelope 1 that substantially corresponds to the portion where the light emitting layer 2 is formed. In addition, first and second openings 7 and 8 are formed between the side edges 5a and 6a and between the side edges 5b and 6b of the external electrodes 5 and 6, respectively. 5b is formed with a triangular shaped deformed portion 5A having periodicity, but may be formed in a suitable shaped such as a rectangular shape or a semicircular shape. The side edges 5a, 6a, 6b of the external electrodes 5, 6 are formed in a straight shape.
[0027]
Further, a conductive member CS is formed in a substantially endless ring shape on the inner surface of the end portion of the envelope 1. In particular, the conductive member CS has a substantially endless ring-like shape on the inner surface of the envelope corresponding to the end 1a of the envelope 1 in which the external electrodes 5 and 6 are not disposed and the light emitting layer 2 is not formed. Is formed. The conductive member CS is formed in a band shape having a width of about 0.2 to 5 mm, preferably about 1 to 3 mm. For example, carbon, silver, zinc oxide, aluminum, tin oxide, indium oxide, barium, nickel, or these In particular, carbon is preferred from the viewpoints of economy and chemical stability. The conductive member Cs is formed by an appropriate method such as transfer, application nozzle, spraying, brushing, etc., and a transfer method using a ring member described later is recommended.
[0028]
Next, a method for manufacturing the rare gas discharge lamp DL will be described with reference to FIG. First, as shown in FIG. 2A, a light emitting layer 2 made of a phosphor is formed on the inner surface of a straight tubular envelope 1 made of a glass bulb. Specifically, the phosphor coating solution is formed by pouring the phosphor coating solution from the upper end 1b of the upright envelope 1, and then drying and pre-baking. Next, as shown in FIG. 2B, the light emitting layer 2 formed on the end portions 1a and 1b of the envelope 1 is peeled off and removed with a brush or the like. Next, as shown in FIG. 3C, the aperture portion 2a is formed by peeling and removing the light emitting layer 2 to have a predetermined opening angle using a scraper made of hard rubber, metal or the like. Next, as shown in FIG. 4D, a conductive member coating solution made of a conductive member CS such as carbon, a binder containing frit glass or the like, or a solvent is applied to the inner surface of the end portion 1a where the light emitting layer 2 is not formed. To do. Specifically, a ring member such as an O-ring is fixed to the tip of a thin rod, and for example, a paste-like conductive member coating solution is applied to the ring member, and the ring member at the tip of the thin rod is surrounded by the envelope 1. The envelope 1 is rotated once with the ring member in contact with the desired portion of the end 1a. As a result, the conductive member coating liquid is deposited (transferred) in an endless ring shape on the entire peripheral surface of the inner surface of the end portion 1a. In this state, the envelope 1 is baked to finally form the light emitting layer 2 and the conductive member CS. Next, one end of the envelope 1 is sealed with a top seal or the like, and after a predetermined amount of rare gas is sealed inside the envelope, the other end is sealed with a top seal or the like. Next, the sheet structure 3 is wound around the outer peripheral surface of the envelope 1 according to, for example, the method shown in FIG. At this time, the external electrodes 5 and 6 are arranged so that the positional relationship between the conductive member CS and the light emitting layer 2 is the positional relationship shown in FIGS. That is, the external electrodes 5 and 6 are arranged so as not to face the portion where the conductive member CS is formed, in other words, so as not to protrude into the end portion 1a where the conductive member CS is formed. Thereby, the rare gas discharge lamp DL shown in FIGS. 1 to 2 is manufactured.
[0029]
The rare gas discharge lamp DL is lit in the same manner as the rare gas discharge lamp shown in FIG. 14, for example, by a lighting device shown in FIG. However, the rare gas discharge lamp DL is surely lit even in a dark environment where little extraneous light is irradiated. The principle of lighting in such a dark state will be described with reference to FIG. First, when a high-frequency voltage is applied to the external electrodes 5 and 6 with the polarity shown in the figure, the envelope 1 is polarized as shown in the figure, and an electric field is generated between the external electrodes in the direction of the arrow shown. On the other hand, an electric current is generated in the conductive member CS, and accordingly, an electric field is generated around the conductive member CS, and initial electrons necessary for discharge are emitted from the conductive member CS to the rare gas atmosphere by the electric field. Therefore, it is considered that the rare gas discharge lamp DL starts to discharge instantaneously.
[0030]
According to this embodiment, the conductive member CS does not face the external electrodes 5 and 6 and is disposed at the end 1a of the envelope 1 where the light emitting layer 2 is not formed. Even if the illuminance under the installation environment is almost dark, which is 0.01 Lx or less, after a fairly long time (for example, about 24 hours) has passed after the light is turned off, a pulsed high frequency voltage is applied to the external electrodes 5 and 6. Can be reliably turned on in a short time of approximately 2000 mS or less, and variations in lighting time can be reduced.
[0031]
In particular, since the conductive member CS is formed in an endless ring shape on the inner surface of the end portion 1a of the envelope 1, even if a crack is formed in a part of the conductive member CS during the manufacturing process, it is sufficiently initial. Electrons can be generated, and the rare gas discharge lamp DL can be reliably turned on in the dark state.
[0032]
The conductive member CS acts as a light shield, but does not face the external electrodes 5 and 6 and is disposed at the end 1a of the envelope 1 where the light emitting layer 2 is not formed. The light emitted from the portion 2a is used effectively, does not cause an adverse effect of reducing the light amount, and does not affect the light emitting layer 2 at all. However, if the conductive member CS is disposed in a portion facing the external electrodes 5 and 6 and the light emitting layer 2 is formed, effective light is shielded by the conductive member CS, and the illuminance distribution in the aperture portion 2a is impaired. It comes to be. In addition, when the conductive member CS is arranged in the formation portion of the light emitting layer 2, the firing condition of the phosphor coating film that becomes the light emitting layer becomes delicate, and although the cause is not clear after commercialization, the light emitting layer 2 is easily discolored. This is not preferable.
[0033]
In addition, since the light emitting layer 2 is not formed on the end portions 1a and 1b of the envelope 1, when the respective end portions are sealed with, for example, a top seal, the phosphor is bitten into the sealed portions. This eliminates the possibility of sealing. Therefore, the occurrence of trouble that the sealing portion is broken after the manufacturing process or product production is drastically reduced, and the quality of the product can be improved.
[0034]
Further, since the triangular shaped deformed portion 5A having periodicity is formed on the side edge 5b of the external electrode 5, when the pulsed high frequency voltage is applied to the external electrodes 5 and 6, the deformed portion The starting characteristics can be improved because the electric field concentrates on 5A. In particular, in the dark state, the presence of the deformed portion 5A and the conductive member CS can be combined to ensure lighting in a short time.
[0035]
  FIG. 7 shows the first aspect of the present invention.1ofreferenceAn example is shown, and the basic configuration is the same as the rare gas discharge lamp DL shown in FIGS. A different point is that the outer electrodes 5 and 6 are directly arranged on the outer peripheral surface of the envelope 1 without using the sheet structure 3, and the conductive member CS is formed in an end ring shape. The conductive member CS is formed at the end 1 a of the envelope 1 that does not face the external electrodes 5 and 6.
[0036]
  ThisExampleAccording to this, as in the first embodiment, reliable lighting in a dark state is possible. In addition, the configuration is simplified as compared with the first embodiment, and the material cost can be reduced. On the other hand, since the external electrodes 5 and 6 must be arranged directly on the outer peripheral surface of the envelope 1, work efficiency is reduced. Also thisExampleThe configuration of the conductive member CS in (1) can also be applied to the first embodiment.
[0037]
  FIG. 8 shows the present invention.2ofreferenceAn example is shown, and the basic configuration is the same as the rare gas discharge lamp DL shown in FIGS. The difference is that the outer electrodes 5 and 6 are arranged directly on the outer peripheral surface of the envelope 1 without using the sheet structure 3, the conductive member CS is adjacent to the edge of the aperture portion 2a, and This is that the end 1a not facing the external electrodes 5 and 6 is formed in an arc shape.
[0038]
  ThisExampleAccording to the number1ofreferenceThe same effect as the example can be obtained. Also thisExampleThe configuration of the conductive member CS in FIG. 6 can also be applied to the first embodiment.
[0039]
  FIG. 9 shows the first aspect of the present invention.2The basic configuration is the same as that of the rare gas discharge lamp DL shown in FIGS. The difference is that the opening angle θ of the aperture 2a formed on the inner surface of the envelope 1 corresponding to the first opening 7 is different._ThreeIs the opening angle θ of the first opening 7.₁This is a larger setting. Opening angle θ of the aperture 2a_ThreeIs set in the range of 70 to 130 degrees, for example, but can be changed as appropriate according to the application and purpose. The opening angle θ of the openings 7 and 8₁, Θ₂Is θ₁> Θ₂The relationship is set.
[0040]
  According to this embodiment, the rare gas discharge lamp can be reliably started even in an environment with poor external light as in the first embodiment. In addition, when the sheet structure 3 is wound around the outer peripheral surface of the envelope 1, even if the center between the first opening 7 and the aperture 2a is slightly shifted, the sheet is released from the first opening 7. The deviation of the optical axis of the light can be reduced. For this reason, even when applied to, for example, a document irradiation reading apparatus, sufficiently high reading accuracy can be obtained. This embodiment is the first1, Number2ofreferenceIt can also be applied to examples.
[0041]
  FIG. 10 shows the first aspect of the present invention.3The basic configuration is the same as that of the rare gas discharge lamp DL shown in FIGS. A different point is that, after attaching a pair of external electrodes 5 and 6 to the outer peripheral surface of the envelope 1 except for the end portions 1a and 1b using an adhesive layer, a PET resin having an adhesive layer on one surface is used. That is, the translucent sheet 4A is wound and bonded to the outer peripheral surface of the envelope 1 so that the external electrodes 5 and 6 are covered.
[0042]
According to this embodiment, the rare gas discharge lamp can be surely turned on even in an environment where external light is scarce, as in the first embodiment. In addition, prior to winding the translucent sheet 4A around the outer peripheral surface of the envelope 1, if a translucent insulating film such as silicone varnish is formed on the outer peripheral surface of the envelope 1, the external The dielectric strength between electrodes can be improved, and perforation to the translucent sheet 4A can also be suppressed.
[0043]
  FIG. 11 shows the present invention.4The basic configuration is the same as that of the rare gas discharge lamp shown in FIGS. The difference is that a pair of external electrodes 5 and 6 are adhered to the outer peripheral surface of the envelope 1 except for the end portions 1a and 1b using an adhesive layer, and then the outer peripheral surface of the envelope 1 is made of PET resin or the like. This is because the protective tube 12 made of heat-shrinkable resin is mounted so that the external electrodes 5 and 6 are covered and heat-shrinked. In addition, after this protective tube 12 is mounted on the envelope 1, it is brought into close contact with the outer peripheral surface of the envelope 1 by heating to, for example, about 150 to 200 ° C. and contracting.
[0044]
  According to this embodiment, the above-described embodiments (first1, Number2ofreferenceCompared to (except for the example), although it is inferior in mechanization and work efficiency, since the adhesive layer is not used for the protective tube 12, corrosion due to the reaction between the constituent members of the terminal and the adhesive component is reduced, and it is prolonged. In addition to being able to maintain a stable operating state, the protective tube 12 has no seams, so that it is possible to completely prevent the overlapping portions of the end portions of the translucent sheets 4 and 4A from peeling off as in the above-described embodiments. .
[0045]
In particular, if a translucent insulating film such as silicone varnish is formed on the outer peripheral surface of the envelope 1 prior to mounting the protective tube 12 on the outer peripheral surface of the envelope 1, insulation between the external electrodes is achieved. Yield strength can be further increased.
[0046]
  FIG. 12 shows the present invention.5The embodiment is shown, and the envelope 1 is shown in a developed state, and the basic configuration is the same as that of the rare gas discharge lamp shown in FIGS. The difference is that the triangular shaped parts 5A and 6A having periodicity are formed on the side edges 5b and 6b of the external electrodes 5 and 6, and the tips (pointed parts) of the shaped parts 5A and 6A are It is arranged so as to face each other within 20% of the deformed portion pitch. The deformed portion may be triangular, rectangular, including trapezoid, semicircular, including ellipse, or the like.
[0047]
  The structure of the external electrode of this embodiment is the same as that of the first embodiment.4Examples ofThe second 1 , 2 reference exampleIt can also be applied to.
[0048]
  FIG. 13 shows the present invention.6The embodiment is shown, and the envelope 1 is shown in a developed state, and the basic configuration is the same as that of the rare gas discharge lamp shown in FIGS. The difference is that all the side edges 5b and 6b of the external electrodes 5 and 6 are formed in a straight shape.
[0049]
According to this embodiment, since the form of the external electrodes 5 and 6 is simplified, punching from a foil-like metal sheet by a press facility becomes easy. The configuration of this embodiment can also be applied to the above-described embodiments.
[0050]
The present invention is not limited to the above examples. For example, phosphors constituting the light emitting layer include cerium / terbium activated lanthanum phosphate phosphors, europium activated yttrium oxide phosphors and the like. Furthermore, a cerium / terbium activated magnesium aluminate phosphor, a cerium / terbium activated yttrium silicate phosphor, a europium activated barium aluminate / magnesium phosphor, and the like can also be used. It is also possible to omit the aperture portion in the light emitting layer and improve the workability of winding the sheet structure around the envelope. Further, the overlapping portion of the end portions of the translucent sheet can be bonded by using heat welding or using both adhesion and welding in addition to adhesion and ultrasonic welding. In particular, in the form of the external electrode, “strip shape” means that the form as a whole is a strip shape, as well as those having a deformed portion at the end as described above, a hole in a non-end portion, etc. Are present or are stitched. Furthermore, the lighting device can be applied not only to generate a pulsed high-frequency voltage but also to generate a sinusoidal high-frequency voltage, and in the combined state with the lighting device, one grounding of the external electrode can be omitted. it can.
[0051]
【Example】
Next, experimental examples will be described. First, a phosphor coating solution obtained by mixing a cerium / terbium activated lanthanum phosphate phosphor, polyethylene oxide (water-soluble binder) and water (solvent) has an outer diameter of 8 mm, a wall thickness of 0.5 mm, and a length. Is applied to the inner surface of an envelope made of lead glass having a thickness of 360 mm and pre-baked. Next, the light emitting layer at the end of the envelope is peeled off with a brush, and a part of the light emitting layer is forcibly peeled off using a scraper to form an aperture portion with an opening angle of 75 degrees. In addition, the adhesion amount of the light emitting layer is 15 mg / cm.₂Is set to Next, a paste-like conductive member coating liquid containing carbon is transferred and coated in an endless ring shape having a width of 1 mm on one inner surface of one end portion from which the light emitting layer has been removed, and then subjected to main baking. Thereafter, a rare gas discharge lamp was manufactured by the same method as the prior art shown in FIG. Note that the distance between the conductive member and the end of the external electrode is 2 mm, an aluminum foil having a width of 8 mm is used for the pair of external electrodes, and one end of the external electrode forming the second opening A triangular shaped deformed portion having a pitch of 4 mm and a vertex height of 1.5 mm was formed only on the other side, and the other opposite end portion was formed in a straight shape.
[0052]
The ten rare gas discharge lamps are sequentially incorporated in the lighting device shown in FIG. 18, and these are left in a dark state where the ambient illuminance is 0.01 Lx or less for 24 hours, and then the frequency between the pair of external electrodes is increased. 62KHz, voltage 1500V_0-PWhen applying a pulsed high-frequency voltage and measuring the time to complete lighting (lighting time),
All the rare gas discharge lamps lighted at 2000 mS or less, and the variation in lighting time was small.
[0053]
【The invention's effect】
  As described above, according to the present invention, the conductive member is disposed on the inner surface of the end portion of the envelope that does not face the external electrode.Endless ringTherefore, even if the installation environment of the rare gas discharge lamp is poor in external light, it can be turned on reliably in a short time by applying a high frequency voltage to the external electrode, and the lighting time Can also reduce the variation. In addition, although the conductive member acts as a light shield, it does not face the external electrode and is formed on the inner surface of the end portion of the envelope where the light emitting layer is not formed, so that it is emitted from the first opening. Light can be used effectively, and discoloration of the light emitting layer can be prevented.
[0054]
In addition, since no light emitting layer is formed at the end of the envelope, when sealing each end with, for example, a top seal, the phosphor does not get caught in the sealed portion. Can be sealed. Therefore, the occurrence of trouble that the sealing portion is broken after the manufacturing process or product production is drastically reduced, and the quality of the product can be improved.
[0055]
Furthermore, if an appropriate deformed portion is formed on the external electrode, the starting characteristics can be improved because the electric field concentrates on the deformed portion, and in the dark state, in combination with the presence of the deformed portion and the conductive member, within a short time. It can be lit reliably.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.
2 is a fragmentary sectional view of the main part of FIG. 1;
3 is a cross-sectional view taken along line XX in FIG.
4 is a development view of the envelope and the external electrode portion of FIG. 1. FIG.
5A and 5B are diagrams for explaining the manufacturing method, in which FIG. 5A is a side sectional view showing a state where a light emitting layer is formed, and FIG. 5B is a view showing a state where the light emitting layers at both ends are removed. FIG. 4C is a longitudinal sectional view showing a state in which an aperture portion is formed, and FIG. 4D is a side sectional view showing a state in which a conductive member is formed in a ring shape on the inner surface of one end portion.
FIG. 6 is a schematic diagram for explaining an operation principle.
FIG. 7 shows the first of the present invention.1ofreferenceThe longitudinal cross-sectional view which shows an example.
FIG. 8 shows the first of the present invention.2ofreferenceThe longitudinal cross-sectional view which shows an example.
FIG. 9 shows the first of the present invention.2The longitudinal cross-sectional view which shows the Example.
FIG. 10 shows the first of the present invention.3The longitudinal cross-sectional view which shows the Example.
FIG. 11 shows the first of the present invention.4The longitudinal cross-sectional view which shows the Example.
FIG. 12 shows the first of the present invention.5The expanded view of the envelope and external electrode part which show the Example of this.
FIG. 13 shows the first of the present invention.6The expanded view of the envelope and external electrode part which show the Example of this.
FIG. 14 is a longitudinal sectional view of a rare gas discharge lamp according to the prior art.
FIG. 15 is a development view of a seat structure according to the prior art.
16 is a YY sectional view of FIG.
FIG. 17 is a longitudinal sectional view for explaining a method for manufacturing a rare gas discharge lamp according to the prior art.
FIG. 18 is an electric circuit diagram of a lighting device for a rare gas discharge lamp according to the prior art.
FIG. 19 is a diagram for explaining the operation of FIG. 18. FIG. 19A is an output signal diagram from the drive circuit, FIG. 19B is an operation timing diagram of the switching element, and FIG. Is a waveform diagram of the coil current, FIG. 4D is a lamp current diagram, and FIG.
FIG. 20 is an enlarged view of FIG. 19, in which FIG. 19 (a) is an operation timing chart of the switching element, FIG. 19 (b) is a lamp current diagram;
[Explanation of symbols]
  DL Noble gas discharge lamp
  HA lighting device
  CS conductive member
  1 Envelope
  1a end
  2 Light emitting layer
  2a Aperture
  3 seat structure
  4,4A Translucent sheet (insulating member)
  5,6 External electrode
  5A, 6A deformed part
  7 First opening
  8 Second opening
  9 Adhesive layer
  12 Protection tube (insulating material)

Claims (8)

A tubular envelope having a light emitting layer on the inner surface and enclosing a rare gas in the internal space;
A pair of band-shaped external electrodes made of metal members arranged on the outer peripheral surface of the envelope so as to be separated from each other so that the first and second openings are formed in the longitudinal direction portion excluding the end thereof;
A conductive member formed on the entire inner surface of the envelope corresponding to the end of the envelope not facing the external electrode and having no light emitting layer formed thereon. A rare gas discharge lamp characterized by A tubular envelope having a light emitting layer on the inner surface and enclosing a rare gas in the internal space;
A pair of band-shaped external electrodes made of metal members arranged on the outer peripheral surface of the envelope so as to be separated from each other so that the first and second openings are formed in the longitudinal direction portion excluding the end thereof;
A conductive member formed on the entire circumference of the envelope on the inner surface of the envelope corresponding to an end of the envelope not facing the external electrode and having no light emitting layer formed thereon ; A rare gas discharge lamp comprising a translucent insulating member mounted on an outer peripheral surface of a vessel so as to be covered with an external electrode.   The rare gas discharge lamp according to claim 2, wherein the insulating member is constituted by a protective tube made of a translucent sheet or a heat-shrinkable resin. A light-emitting layer on the inner surface, and an envelope of tubular ing by sealing rare gas to the internal space,
A pair of belt-like external electrodes made of a metal member having a length shorter than the full length of the envelope are provided on one surface of the translucent sheet having a length substantially the same as the full length of the envelope. a seat assembly which is spaced apart from each other so as to form openings, and obtained by forming an adhesive layer on the translucent sheet surface and the external electrode surface on a side position of the external electrodes,
A conductive member formed on the entire inner surface of the envelope corresponding to the end of the envelope not facing the external electrode and having no light emitting layer formed thereon. And
It said outer sheet structure on the outer peripheral surface of the envelope, a rare gas discharge lamp, characterized in that the external electrode was wound so as to be positioned between the envelope and the translucent sheet.   5. The rare gas release according to claim 1, wherein the conductive member is carbon, silver, zinc oxide, aluminum, tin oxide, indium oxide, barium, nickel, or a substance containing them. Electric light. The envelope inner surface substantially corresponding to said first opening, dilute according to any one of claims 1 to 4, characterized in that the formation of the aperture portion is not formed in the light-emitting layer Gas discharge lamp. Forming a light emitting layer on the inner surface of the tubular envelope;
Forming a conductive member on an entire circumference of the envelope in an end portion of the inner surface of the envelope where the light emitting layer is not formed;
Sealing the envelope in which the conductive member is formed in a state in which a rare gas is sealed therein;
Forming an external electrode on the outer peripheral surface of the envelope, and
The step of forming the conductive member includes
Applying a solution containing the conductive member to the ring member;
The ring member coated with the solution is inserted into the envelope, and the envelope is rotated while the ring member is in contact with the inner surface of the envelope at the end of the envelope. Transferring the solution onto the inner surface of the envelope, thereby producing a rare gas discharge lamp. 8. The method of manufacturing a rare gas discharge or the like according to claim 7, wherein the step of forming the external electrode includes disposing the external electrode so as not to protrude into a portion where the conductive member is formed.

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