JP2012009334A - Glass tube, fluorescent lamp, method of manufacturing glass tube, and method of manufacturing fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent lamp such that an inner peripheral surface of a glass tube is not easily damaged.SOLUTION: The glass tube 20 of the fluorescent lamp has a glass tube body 20a, a solid lubricant layer 21 formed on the inner peripheral surface of the glass tube body 20a, a protection film layer 22 which is formed on the solid lubricant layer 21 and suppresses emission of ultraviolet light from inside to outside the glass tube body 20a, and a phosphor layer 23 which is formed on the protection film layer 22 and emits visible light. Consequently, the inner peripheral surface of the glass tube body 20a is not easily damaged during manufacturing processes of the fluorescent lamp.

Description

  The present invention relates to a glass tube, a fluorescent lamp, a method for manufacturing a glass tube, and a method for manufacturing a fluorescent lamp.

  The glass tube used for the fluorescent lamp may be damaged on the outer peripheral surface when the glass tubes come into contact with each other during transportation, storage, or transportation in the manufacturing process, or contact with other members. For this reason, the outer peripheral surface of a glass tube is covered with the coating layer (for example, refer patent document 1).

JP 2010-001179 A

  However, in the fluorescent lamp according to Patent Document 1, the coating layer is formed only on the outer peripheral surface of the glass tube, and is not formed on the inner peripheral surface. Therefore, there is a risk of scratching the inner peripheral surface of the glass tube in a fluorescent lamp manufacturing process or the like.

  The present invention has been made under the circumstances described above, and it is an object of the present invention to provide a glass tube that is less likely to be scratched on the inner peripheral surface, a fluorescent lamp using the glass tube, and the like.

In order to achieve the above object, the glass tube according to the first aspect of the present invention comprises:
A glass tube of a fluorescent lamp,
A glass tube body,
A first coating layer formed on the inner peripheral surface of the glass tube body;
A protective film layer that is formed on the first coating layer and suppresses the emission of ultraviolet rays from the inside of the glass tube body to the outside;
A phosphor layer that is formed on the protective film layer and generates visible light;
Have

The fluorescent lamp of the second aspect of the present invention is
The above glass tube,
A support part that is attached to both ends of the glass tube and includes a filament that discharges when a voltage is applied;
A discharge gas enclosed in the glass tube and generating ultraviolet rays;
Have

The manufacturing method of the glass tube of the 3rd viewpoint of this invention is the following.
Cleaning and drying the glass tube body of the glass tube;
Applying a dispersion containing polyethylene wax on the inner peripheral surface of the glass tube body to form a first coating layer;
Applying a dispersion containing fine particle oxide on the first coating layer to form a protective film layer;
Applying a phosphor-containing dispersion on the protective film layer to form a phosphor layer;
including.

The fluorescent lamp manufacturing method according to the fourth aspect of the present invention includes:
Attaching both ends of the glass tube manufactured by the above-described method for manufacturing a glass tube to a support portion including a filament that discharges when a voltage is applied;
Enclosing a discharge gas for generating ultraviolet rays inside the glass tube;
including.

  According to the present invention, the glass tube has the first coating layer on the inner peripheral surface. Therefore, the inner peripheral surface of the glass tube main body is hardly damaged.

It is a front view of the fluorescent lamp which concerns on embodiment of this invention. It is sectional drawing of a glass tube. It is a circuit diagram of an illuminating device. It is sectional drawing of the glass tube of the fluorescent lamp which concerns on the modification of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a fluorescent lamp 10 according to the present embodiment. As shown in FIG. 1, the fluorescent lamp 10 has a glass tube 20 and a support portion 30 for connection to a commercial power supply system.

  As shown in FIG. 2, the glass tube 20 includes a glass tube body 20a, a solid lubricant layer 21 laminated on the inner peripheral surface of the glass tube body 20a, a protective film layer 22, and a phosphor layer 23. Have. The glass tube body 20a is made of soft glass, for example. Moreover, the shape of the glass tube main body 20a is a straight tube shape. The outer diameter of the glass tube main body 20a is, for example, 15 mm to 38 mm, and the thickness of the glass tube main body 20a is, for example, 1 mm.

  The solid lubricant layer 21 is formed on the inner peripheral surface of the glass tube main body 20a. The solid lubricant layer 21 is formed by applying a solid lubricant. The material of the solid lubricant is, for example, polyethylene wax.

The protective film layer 22 is formed on the solid lubricant layer 21. The material of the protective film layer 22 is, for example, a fine particle oxide such as alumina. The weight of the protective film layer 22 is, for example, 0.01 mg to 0.06 mg per 1 cm ² . Moreover, the thickness of the protective film layer 22 is 1.0 micrometer-3.0 micrometers, for example.

The phosphor layer 23 is formed on the protective film layer 22. Moreover, the weight of the phosphor layer 23 is, for example, ³ mg to 7 mg per 1 cm ² . The phosphor layer 23 cannot emit light sufficiently when its thickness is less than 3 μm, and is easily peeled off when its thickness is greater than 50 μm. Therefore, the thickness of the phosphor layer 23 is, for example, 3 μm to 50 μm, and a more preferable thickness is 5 μm to 30 μm.

  The phosphor contained in the phosphor layer 23 is, for example, a three-wavelength phosphor, and includes a red light-emitting phosphor, a green light-emitting phosphor, and a blue light-emitting phosphor. Of the phosphors forming the phosphor layer 23, the content ratio of the red light emitting phosphor is 35 wt%. And the content rate of a green light emission fluorescent substance is 41 wt%, and the content rate of a blue light emission fluorescent substance is 24 wt%.

The material of the red light emitting phosphor is, for example, yttrium oxide (Y ₂ O ₃ : Eu) using europium as an activator. Europium activated yttrium oxide has an emission peak wavelength in the vicinity of 610 nm. The concentration of europium is 10 wt%. When the average particle diameter of the red light emitting phosphor is smaller than 4 μm, the light emission intensity of the phosphor decreases, and when it exceeds 6 μm, the thickness of the phosphor layer 23 increases and the transmittance decreases. Therefore, the average particle diameter of the red light emitting phosphor is preferably 4 to 6 μm.

The material of the green light emitting phosphor is, for example, lanthanum phosphate (LaPO ₄ : Ce, Tb) using cerium and terbium as activators. Cerium and terbium activated lanthanum phosphate has an emission peak wavelength around 540 nm. The concentration of cerium and terbium in the green light emitting phosphor is 30 wt%. Moreover, the content rate of terbium is 1.2 times the content rate of cerium. The average particle size of the green light emitting phosphor is preferably 4 to 6 μm.

The material of the blue light-emitting phosphor is barium magnesium aluminate (BaMg ₂ Al ₁₆ O ₂₇ : Eu) using europium as an activator. Europium activated barium magnesium aluminate has an emission peak wavelength near 450 nm. The concentration of europium is 8-10 wt%. The average particle size of the blue light emitting phosphor is preferably 6 to 7 μm.

  The support part 30 is attached to both ends of the glass tube 20. The support part 30 has an electrode 31 and a base. The electrode 31 has a coiled filament 32 coated with an emitter. BaO, SrO, CaO or the like is used as a material for the emitter.

  A discharge gas is sealed inside the glass tube 20. The discharge gas includes, for example, mercury vapor and a rare gas. The mercury vapor is for obtaining ultraviolet light that causes the phosphor of the phosphor layer 23 to emit light. The rare gas is for adjusting the pressure inside the fluorescent lamp 10 to a predetermined pressure, and is a mixed gas of argon and neon. The ratio of argon to neon is, for example, 5 wt% for argon and 95 wt% for neon.

  The fluorescent lamp 10 mentioned above is attached to the illuminating device 40, for example so that it may understand with reference to FIG. The lighting equipment 40 includes a socket 41 to which the support unit 30 is connected, an electronic ballast 42, and a lighting tube 43. The lighting equipment 40 is connected to an electrical system 50 that is a commercial AC power supply via a switch SW.

  The electronic ballast 42 supplies a preheating voltage to the electrode 31 in order to obtain a temperature suitable for lighting the fluorescent lamp 10.

  The lighting tube 43 has a fixed electrode and a bimetal electrode that is deformed when heat is applied. The lighting tube 43 is connected in parallel to the fluorescent lamp 10.

  When the switch SW is turned on in the state described above, the electrode 31 is electrically connected to the power supply system 50. At this time, it is not discharged between the electrodes 31 of the fluorescent lamp 10 but discharged between the electrodes of the lighting tube 43. If it does so, heat will generate | occur | produce by discharge and the heated bimetal electrode will deform | transform and the electrodes in the lighting tube 43 will contact.

  When the electrodes in the lighting tube 43 come into contact with each other, the contacts in the lighting tube 43 are closed, so that the emitter of the filament 32 is preheated. If it does so, the temperature of the mercury vapor | steam in the glass tube 20 will rise by this heat, and the electrode 31 of the fluorescent lamp 10 will become easy to be discharged. On the other hand, the lighting tube 43 is not discharged, the lighting tube 43 is cooled, the heated bimetal electrode is cooled and returns to its original shape, and the two electrodes of the lighting tube 43 are separated from each other.

  When the electrodes in the lighting tube 43 are separated from each other, the contacts in the lighting tube 43 are opened, so that the magnetic flux penetrating the electronic ballast 42 is greatly changed, and a high voltage is generated. Due to this high voltage, a high voltage is applied to the emitter of the preheated filament 32, discharge starts, and current begins to flow between the electrodes 31 of the fluorescent lamp 10. Then, ultraviolet rays generated by collision of electrons and mercury atoms due to discharge hit the phosphor contained in the phosphor layer 23 to generate visible light. Thereby, the fluorescent lamp 10 is turned on.

  The fluorescent lamp 10 described above is manufactured as follows. First, the preliminarily shaped glass tube body 20a is washed with pure water, ion exchange water, city water, or the like and dried. Next, the dispersion liquid is applied to the inner peripheral surface of the glass tube body 20a by spraying the dispersion liquid containing the solid lubricant. And a dispersion liquid is dried by baking the glass tube main body 20a. The dispersion liquid may be dried by natural drying. Thereby, the solid lubricant layer 21 is formed.

  Next, the dispersion liquid is applied onto the formed solid lubricant layer 21 by spraying a dispersion liquid containing ultrafine oxide. Then, the dispersion is dried. Thereby, the protective film layer 22 is formed. Next, the dispersion liquid is applied onto the formed protective film layer 22 by spraying a dispersion liquid containing a phosphor. Then, the dispersion is dried. Thereby, the phosphor layer 23 is formed. Thus, the manufacture of the glass tube 20 is completed.

  Next, a discharge gas is sealed in the glass tube 20. And the support part 30 is attached to the glass tube 20 with which discharge gas was enclosed, and it seals. Thus, the manufacture of the fluorescent lamp 10 is completed.

  As described above, the glass tube 20 of the fluorescent lamp 10 according to the present embodiment has the solid lubricant layer 21 on the inner peripheral surface. For this reason, the fluorescent lamp 10 is less likely to be scratched on the inner peripheral surface of the glass tube body 20a during the manufacturing process. Moreover, since it becomes difficult to damage the glass tube main body 20a, it becomes difficult to generate a crack starting from the scratch, and the strength of the glass tube 20 is improved.

  As mentioned above, although embodiment of this invention was described, this invention is not limited by the said embodiment etc.

  For example, in the above embodiment, the solid lubricant layer 21 is formed only on the inner peripheral surface of the glass tube body 20a. Not limited to this, as shown in FIG. 4, a solid lubricant layer 24 may be formed on the outer peripheral surface of the glass tube body 20a. Thereby, both the inner peripheral surface and the outer peripheral surface of the glass tube main body 20a can be prevented from being damaged. In this case, the solid lubricant layer 24 may be formed simultaneously with the solid lubricant layer 21 or may be formed separately.

  Moreover, in the said embodiment, although the fluorescent lamp 10 is a straight tube | pipe-shaped fluorescent lamp, it is not restricted to this, A ring-shaped fluorescent lamp and a light bulb-shaped fluorescent lamp may be sufficient.

  Moreover, in the said embodiment, although the raw material of the protective film layer 22 is an alumina, not only this but yttrium oxide, cerium oxide, aluminum oxide, silicon dioxide, lanthanum oxide, magnesium oxide, etc. may be sufficient.

  Moreover, in the said embodiment, although the fluorescent lamp 10 has the protective film layer 22, not only this but the protective film layer 22 can also be eliminated.

In the above embodiment, the phosphor of the phosphor layer 23, a three is a wavelength region phosphor is not limited to this, calcium halophosphate phosphor _{(Ca 10 (PO 4) 3} FCl: Sb, Mn) in such Good.

In the above embodiment, the material of the red light-emitting phosphor is europium-activated yttrium oxide (Y ₂ O ₃ : Eu), but is not limited thereto, and 3.5MgO · 0.5MgF · GeO ₂ : Mn There may be. Or the material containing both may be sufficient.

Further, the blue light emitting phosphor is europium activated barium magnesium aluminate (BaMg ₂ Al ₁₆ O ₂₇ : Eu), but is not limited thereto, and (Sr, Ca, Ba) ₅ (PO ₄ ) ₃ Cl: Eu. It may be. Or the material containing both may be sufficient.

  In the above embodiment, when forming the solid lubricant layer 21, the protective film layer 22, and the phosphor layer 23, the dispersion liquid containing the solid lubricant, the ultrafine oxide, and the phosphor is sprayed. However, the present invention is not limited to this, and it may be applied using a solution soaked with a dispersion. Further, the glass tube 20 may be immersed in the dispersion.

  Various embodiments and modifications can be made to the present invention without departing from the broad spirit and scope of the present invention. The above-described embodiments are for explaining the present invention, and do not limit the scope of the present invention.

  A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.

  (Additional remark 1) It is a glass tube of a fluorescent lamp, Comprising: The glass tube main body, the 1st coating layer formed in the internal peripheral surface of the said glass tube main body, and the said glass tube main body formed on the said 1st coating layer The glass tube which has a protective film layer which suppresses discharge | release of the ultraviolet-ray from the inside to the exterior, and the fluorescent substance layer which is formed on the said protective film layer and generate | occur | produces visible light.

  (Additional remark 2) The said 1st coating layer is a glass tube of Additional remark 1 which consists of polyethylene wax.

  (Additional remark 3) The glass tube of Additional remark 1 or 2 which further has the 2nd coating layer formed in the outer peripheral surface of the said glass tube main body.

  (Additional remark 4) The said 2nd coating layer is a glass tube of Additional remark 3 which consists of polyethylene wax.

  (Supplementary note 5) The glass according to any one of supplementary notes 1 to 4, wherein the phosphor layer is made of a three-wavelength phosphor having a red light-emitting phosphor, a green light-emitting phosphor, and a blue light-emitting phosphor. tube.

  (Appendix 6) The glass tube according to any one of appendices 1 to 4, wherein the phosphor layer is made of calcium halophosphate.

  (Supplementary note 7) The glass tube according to any one of supplementary notes 1 to 6, a support unit including a filament attached to both ends of the glass tube and discharging when a voltage is applied, and the inside of the glass tube And a discharge gas which is sealed in and generates ultraviolet rays.

  (Additional remark 8) The process of wash | cleaning and drying the glass tube main body of a glass tube, The process of apply | coating the dispersion liquid containing a polyethylene wax to the internal peripheral surface of the said glass tube main body, and forming a 1st coating layer, Applying a dispersion containing fine particle oxide on the first coating layer to form a protective film layer; and applying a dispersion containing phosphor on the protective film layer; And a step of forming a phosphor layer.

  (Additional remark 9) The manufacturing method of the glass tube of Additional remark 8 which further includes the process of apply | coating the dispersion liquid containing a polyethylene wax to the outer peripheral surface of the said glass tube main body, and forming a 2nd coating layer.

  (Additional remark 10) The process of attaching the support part provided with the filament which discharges by applying a voltage to the both ends of the glass tube manufactured by the manufacturing method of the glass tube described in Additional remark 8 or 9, and the said glass tube And a step of enclosing a discharge gas for generating ultraviolet rays inside.

DESCRIPTION OF SYMBOLS 10 Fluorescent lamp 20 Glass tube 20a Glass tube main body 21 Solid lubricant layer 22 Protective film layer 23 Phosphor layer 24 Solid lubricant layer 30 Support part 31 Electrode 32 Filament 40 Illumination device 41 Socket 42 Electronic ballast 43 Lighting tube 50 Power supply system SW switch

Claims (10)

A glass tube of a fluorescent lamp,
A glass tube body,
A first coating layer formed on the inner peripheral surface of the glass tube body;
A protective film layer that is formed on the first coating layer and suppresses the emission of ultraviolet rays from the inside of the glass tube body to the outside;
A phosphor layer that is formed on the protective film layer and generates visible light;
Glass tube with   The glass tube according to claim 1, wherein the first coating layer is made of polyethylene wax.   The glass tube according to claim 1, further comprising a second coating layer formed on an outer peripheral surface of the glass tube main body.   The glass tube according to claim 3, wherein the second coating layer is made of polyethylene wax.   The glass tube according to any one of claims 1 to 4, wherein the phosphor layer is made of a three-wavelength region phosphor having a red light-emitting phosphor, a green light-emitting phosphor, and a blue light-emitting phosphor.   The glass tube according to any one of claims 1 to 4, wherein the phosphor layer is made of calcium halophosphate. A glass tube according to any one of claims 1 to 6;
A support part that is attached to both ends of the glass tube and includes a filament that discharges when a voltage is applied;
A discharge gas enclosed in the glass tube and generating ultraviolet rays;
A fluorescent lamp. Cleaning and drying the glass tube body of the glass tube;
Applying a dispersion containing polyethylene wax on the inner peripheral surface of the glass tube body to form a first coating layer;
Applying a dispersion containing fine particle oxide on the first coating layer to form a protective film layer;
Applying a phosphor-containing dispersion on the protective film layer to form a phosphor layer;
A method of manufacturing a glass tube including: Applying a dispersion containing polyethylene wax to the outer peripheral surface of the glass tube body to form a second coating layer;
Furthermore, the manufacturing method of the glass tube of Claim 8. Attaching a support portion having a filament that discharges when a voltage is applied to both ends of a glass tube manufactured by the method of manufacturing a glass tube according to claim 8 or 9;
Enclosing a discharge gas for generating ultraviolet rays inside the glass tube;
The manufacturing method of the fluorescent lamp containing this.

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