JP3851242B2 - Electrodeless lamp and light emitting bulb manufacturing method for electrodeless lamp - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a light emitting bulb for an electrodeless lamp in which a protective layer is formed on the inner surface of an outer tube, an electrodeless lamp provided with the light emitting bulb, and a method for manufacturing a light emitting bulb for an electrodeless lamp.
[0002]
[Prior art]
Since the electrodeless fluorescent lamp does not have a filament and an electrode that determine the life of a general fluorescent lamp, the electrodeless fluorescent lamp exhibits a long life characteristic superior to that of a general fluorescent lamp. This electrodeless fluorescent lamp (hereinafter simply referred to as “electrodeless lamp”) has, for example, a glass light-emitting bulb having a cylindrical recess and an excitation coil embedded in the recess, and the excitation coil has a high frequency. By generating an AC magnetic field in the light emitting bulb by flowing an alternating current, an inert gas and mercury gas plasma enclosed in the light emitting bulb is formed, and the fluorescent light on the inner surface of the light emitting bulb is generated by ultraviolet rays generated at this time. The layer is excited to generate visible light.
[0003]
The light emitting bulb includes an outer tube including a spherical container portion having an opening, an extending portion extending outward from the opening, and a bottomed cylindrical inner tube for forming the concave portion. The end of the inner tube on the opening side is sealed to the extending portion of the outer tube. Thereby, a sealed discharge space is formed between the outer tube and the inner tube.
As described above, a glass material is used for the container portion, and a protective layer is formed between the inner surface of the container portion and the fluorescent layer in order to prevent sodium from eluting from the glass material during lighting. . The reason for preventing the elution of sodium is that when the sodium is eluted, it is combined with mercury in the light emitting bulb to become amalgam, and the amount of mercury in the discharge space is reduced to reduce the luminous flux.
[0004]
FIG. 3 is a diagram for explaining a conventional method of forming a protective layer on the inner surface of the outer tube.
First, with the opening 57a of the extending portion 57 of the outer tube 52 facing upward, as shown in FIG. 3A, the outflow nozzle 60 that flows out the suspension 61 for the protective layer is moved in the X direction. The tip is inserted into a predetermined position in the outer tube 57 from the opening 57 a of the extending portion 57.
[0005]
The outflow nozzle 60 flows out the suspension 61 downward from the tip. Then, the suspension 61 is caused to flow out from the outflow nozzle 60 until the suspension 61 in the outer tube 57 reaches a predetermined position. As a result, the suspension 61 is applied to a predetermined range of the container portion 56, for example, the entire inner surface. The suspension 61 is composed of alumina particles and pure water.
[0006]
Next, as shown in FIG. 3 (b), the outer tube 52 is tilted, and the suspension 61 is discharged from the opening 57a of the extending portion 57. When this is finished, the opening 57a of the extending portion 57 is opened. The outer tube 52 is inverted so that it faces down. In this state, the drying nozzle 62 is inserted into the outer tube 52 from below. The drying nozzle 62 ejects warm air from its tip, and the suspension 61 in the outer tube 52 is dried by this warm air.
[0007]
Finally, when the suspension 61 is discharged and when the suspension 61 is dried, the protective layer (alumina particles) attached to the inner surface of the extending portion 57 is, for example, as shown in FIG. Cleaning and removal are performed by the ultrasonic cleaning device 63. That is, the alumina particles are cleaned and removed using ultrasonic vibration in a state where the stretched portion where the alumina particles adhere to the inner surface is immersed in the cleaning liquid 65 in the cleaning tank 64. The removal of the alumina particles cannot be easily removed even if the stretched portion 57 is wiped or flushed with water because the particles are very fine, and the ultrasonic cleaning device 63 is used.
[0008]
When the washing and removal are completed, a fluorescent layer is formed on the protective layer formed by drying the suspension 61 again, and then the extending portion 57 of the outer tube 52 and the end of the inner tube are sealed. . When the suspension 61 is dried, when the extending portion 57 of the outer tube 52 is directed upward, the suspension 61 is collected on the head of the outer tube 52 (the end opposite to the extending portion 57). The protective layer to be formed becomes thick, and the visible light transmittance is deteriorated.
[0009]
The reason for removing the protective layer (alumina particles) attached to the inner surface of the extending portion 57 is that when sealing with the inner tube, the glass material is melted by the heat, and the alumina particles enter the glass material. This is because the inert gas in the light emitting bulb leaks (leaks) when the lamp is turned on.
[0010]
[Problems to be solved by the invention]
In the conventional method for manufacturing a light emitting bulb, there is a problem that productivity is poor because a step of removing alumina particles attached to the extending portion 57 is necessarily required.
Further, when the ultrasonic cleaning device 63 is used for removing the alumina particles, the alumina particles removed from the extending portion 57 are scattered in the cleaning liquid 65. Although the cleaning liquid 65 is circulated and filtered to recover the alumina particles in the liquid, the alumina particles cannot be completely removed from the stretching part 57 as long as the stretching part 57 is immersed in the cleaning liquid 65. For this reason, there exists a problem that the reliability of a sealing part becomes low.
[0011]
The present invention has been made in view of the above problems, and is for an electrodeless lamp capable of preventing the suspension for the protective layer from adhering to the planned sealing site between the inner tube and the outer tube. Manufacturing method of luminous bulb Law Another object of the present invention is to provide an electrodeless lamp including a light emitting bulb manufactured by the manufacturing method.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, a light-emitting bulb according to the present invention is sealed to a peripheral portion of an opening having an inner tube inserted in an outer tube having an opening and a protective layer formed on an inner surface. A light-emitting bulb for an electrodeless lamp, wherein the outer tube has a drooping protective liquid reservoir in the vicinity of the sealing portion and on the protective layer side.
[0013]
According to this, for example, when drying the protective liquid applied to the inner surface of the outer tube, the protective liquid that hangs down along the inner surface of the outer tube can be stored in the reservoir even if the opening of the outer tube faces downward. it can. For this reason, it is possible to prevent the protective liquid from flowing into the planned sealing site with the inner tube.
Further, the outer tube has a substantially axisymmetric shape, and one end portion in the axial direction is open. For this reason, for example, when the protective liquid is applied or dried, the thickness of the protective liquid in the outer pipe can be reduced by rotating the outer pipe around its axis.
[0014]
Further, a part of the drooping protective liquid reservoir part extends outward from the vicinity of the sealing part, and in particular, the drooping protective liquid reservoir part is formed in a direction substantially orthogonal to the axis. It is characterized by having a substantially flat portion. According to this, for example, the amount of the protective liquid stored in the reservoir can be increased. Therefore, it is possible to more reliably prevent the protective liquid from flowing into the planned sealing site with the inner tube.
[0015]
Moreover, a fluorescent layer is formed on the inner layer of the protective layer. In particular, a fluorescent layer is also formed on the inner surface of the drooping protective liquid reservoir, and the thickness of the fluorescent layer is thicker than that of fluorescent layers formed in other parts. For this reason, the luminous flux at the time of light emission can be increased.
Moreover, the light-emitting bulb according to any one of claims 1 to 6 is provided. For this reason, since it has the light emitting bulb which can be manufactured efficiently, the electrodeless lamp which can be manufactured efficiently as a whole can be obtained.
[0016]
In particular, the electrodeless lamp includes a holding member that holds the light emitting bulb, and a cover that covers the outer surface of the drooping protective liquid reservoir of the arc tube bulb held by the holding member so as not to be seen. It is characterized by that. By increasing the thickness of the fluorescent layer on the inner surface of the reservoir, the amount of visible light increases. On the other hand, since the reservoir is covered with the cover, there is no problem even if the visible light transmitted through the fluorescent layer is reduced.
[0017]
In addition, in a method of manufacturing a light-emitting bulb for an electrodeless lamp, the inner tube is inserted into an outer tube having an opening and a protective layer formed on the inner surface, and the inner tube is inserted and sealed at the peripheral edge of the opening. The outer tube has a reservoir portion in the vicinity of the sealing portion and on the side where the protective layer is to be formed, and the formation of the protective layer on the inner surface of the outer tube Applying the suspension for the protective layer to the reservoir, and applying the suspension while storing the suspension that hangs down the inner surface of the outer tube with the opening of the outer tube facing downward. It is characterized by being made through a drying step.
[0018]
According to this, for example, when the suspension applied to the inner surface of the outer tube is dried, the suspension that hangs down along the inner surface of the outer tube is stored in the reservoir even if the opening of the outer tube is directed downward. Can do. For this reason, it is possible to prevent the suspension from flowing into the site to be sealed with the inner tube.
Furthermore, a step of sucking and discharging the suspension after application with the opening facing upward is performed between the application step and the drying step. For this reason, the suspension in the outer tube can be discharged without causing the suspension in the outer tube to adhere to the site to be sealed with the inner tube.
[0019]
Further, the drying step is characterized in that the outer tube is rotated around the tube axis, and the upside down of the outer tube is performed while the outer tube is rotated around the tube axis. It is characterized by that. For this reason, variation in the thickness of the suspension on the inner surface of the outer tube can be reduced.
In addition, the application and discharge of the suspension is performed by a nozzle having a function of ejecting the suspension and a function of sucking and discharging the suspension. For this reason, it is possible to efficiently apply and discharge the suspension.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of an electrodeless fluorescent lamp according to the present invention will be described with reference to the drawings.
1. Configuration of electrodeless fluorescent lamp
FIG. 1 is a front view showing an entire structure in which a part of an electrodeless fluorescent lamp according to the present invention is cut out. The electrodeless fluorescent lamp (hereinafter simply referred to as “electrodeless lamp”) 10 utilizes a so-called electromagnetic inductively coupled discharge (H discharge).
[0021]
The electrodeless lamp 10 has a light emitting bulb 12 made of translucent glass. Mercury (Hg) and an inert gas such as krypton (Kr) gas are sealed in the discharge space 34 in the light emitting bulb 12 as a discharge substance.
The light emitting bulb 12 has a bottomed cylindrical recess 14, and an excitation coil unit 20 is embedded in the recess 14. The excitation coil unit 20 includes a core 21 and an excitation coil 22 that is turned around the outer periphery of the core 21. The light emitting bulb 12 will be described in detail later.
[0022]
A circularly extending portion 26 of an aluminum heat sink 25 is inserted on the inner peripheral side of the excitation coil unit 20 as a heat dissipation means for preventing a temperature rise of the core 21 when a current is passed through the excitation coil 22. . The heat sink 25 has a cup-shaped portion 27 extending to the circular extending portion 26, and the cup-shaped portion 27 is fixed to a synthetic resin case 28.
[0023]
The case 28 is connected to the excitation coil 22 and houses a high-frequency drive circuit 30 for flowing a high-frequency alternating current through the excitation coil 22. Further, a base 31 having the same standard as that of a general incandescent bulb is attached to the case 28, and electric power from a commercial power source is supplied to the high frequency driving circuit 30 through the base 31.
The light emitting bulb 12 has, for example, the shape of a light emitting bulb used in a general incandescent bulb or a bulb-type fluorescent lamp, for example, A shape, and is inserted into the outer tube 16 and the outer tube 16. The inner tube 15 is provided. The outer tube 16 includes a spherical container portion 17 having an opening 17a, and the container portion 17
It has a cylindrical extending portion 18 extending outward from the peripheral edge of the opening 17a in the tube axis A direction of the outer tube 16. Further, the opening 17 a of the container portion 17 is provided on one end side in the tube axis A direction of the container portion 17.
[0024]
The inner tube 15 has a bottomed cylindrical shape so that the excitation coil unit 20 can be accommodated therein, and the end opposite to the bottom is sealed to the extending portion 18 of the outer tube 16. As a result, a sealed discharge space 34 is formed between the inner tube 15 and the outer tube 16. The protective layer described in the prior art is formed on the inner surface of the light emitting bulb 12, that is, the inner surface of the outer tube 16 and the outer surface of the inner tube 15, and a fluorescent layer is formed on the protective layer. The protective layer is formed by applying a suspension for the protective layer to the inner surface of the light emitting bulb 12 and drying the applied suspension.
[0025]
The outer tube 16 is formed with a reservoir portion 19 that extends outward in the direction perpendicular to the tube axis A from the vicinity of the sealing portion 13 in the discharge space 34, as will be described in the manufacturing method described later. The reservoir portion 19 is formed over the entire circumference of the peripheral edge portion of the opening 17a of the container portion 17, and is a portion flat in the direction orthogonal to the tube axis A (hereinafter simply referred to as "flat portion 19a"). )have.
[0026]
As shown in FIG. 1, the sealing portion 13 that seals the outer tube 16 and the inner tube 15 is separated from the peripheral portion of the opening 17a of the container portion 17 because of the heat at the time of sealing. This is to prevent the fluorescent layer from being transmitted to the reservoir 19 and wrinkling the fluorescent layer formed on the inner surface of the reservoir 19 or peeling off in severe cases.
2. Manufacturing method of luminous bulb
The outer tube 16 for the light emitting bulb having the above-described configuration is prepared. The outer tube 16 is before being sealed with the inner tube, and the extending portion 18 extends long in the direction of the tube axis A as shown in FIG. The length of the extending portion 18 only needs to be longer than the distance from the end of the container portion 17 on the opening 17a side to the site to be sealed with the inner tube 15 (sealing portion 13 in FIG. 1). However, in the present embodiment, the outer tube 16 is rotated or reversed so that the elongated portion 18 is long enough to be gripped at that time.
[0027]
Now, a method for manufacturing a light emitting bulb, particularly a method for forming a protective layer on the inner surface of the outer tube 16 will be described. First, the outer tube 16 is arranged so that the opening 18a of the extending portion 18 is on the upper side, the application nozzle 40 is moved in the X direction, and the application nozzle 40 is inserted into the outer tube 16 from the opening 18a of the extending portion 18. Then, the suspension is applied and discharged.
Here, the application nozzle 40 will be described. The application nozzle 40 has a liquid ejection part 40a for ejecting the suspension 41 from its lower end, and a liquid suction part 40b for sucking and discharging the suspension 41 from its lower end. In this embodiment, the application nozzle 40 has a double tube structure. For example, the suspension is sucked and discharged through the inner tube, and the suspension is ejected through the outer tube. . And the liquid ejection part 40a ejects the suspension 41 from the position away from the front-end | tip of the liquid suction part 40b predetermined distance.
[0028]
The distance between the lower end of the liquid suction part 40 b and the lower end of the liquid ejection part 40 a is substantially equal to the distance between the upper limit position of the application range in which the suspension 41 should be applied in the container 17 and the bottom part of the container 17. That is, when the tip (lower end) of the liquid suction part 40b reaches the bottom of the container 17, the suspension 41 ejected from the liquid ejection part 40a is just placed on the upper limit position where the suspension 41 is applied. It has become.
[0029]
The liquid ejection part 40a ejects the suspension 41 from the lower end in four directions (for example, four directions at intervals of 90 °) when viewed from the direction of the axis A of the nozzle (plan view). Further, the direction in which the suspension 41 is ejected is a direction substantially orthogonal to the axis of the nozzle.
In the state where the application nozzle 40 having such a configuration is inserted into the outer tube 16 so that the tip of the liquid suction part 40b reaches the bottom of the container part 17, as shown in FIG. Suspension 41 is ejected from 40a.
[0030]
At this time, the outer tube 16 is rotated around the tube axis A in the Y direction. The reason for rotating the outer tube 16 is to apply the suspension 41 to the inner surface of the container portion 17 so as to be substantially uniform. The suspension 41 is composed of alumina particles and pure water, as in the conventional case, and has a viscosity comparable to that of pure water.
Next, when the application of the suspension 41 to the inner surface of the container portion 17 is completed, as shown in FIG. 2 (b), the outer tube 16 is left as it is (with the extending portion 18 facing up). The suspension 41 accumulated in the container part 17 is sucked and discharged from the liquid suction part 40. The discharged suspension 41 is collected into a tank through a filter (not shown). The collected suspension 41 is sent out again from the tank to the liquid ejection part 40a.
[0031]
As described above, since the suspension 41 ejected from the liquid ejection part 40a and accumulated in the outer tube 16 is discharged through the liquid suction part 40b, the suspension 41 is removed as in the prior art. It does not adhere to the extending portion 18 during discharge. Furthermore, since the application nozzle 40 can eject and discharge the suspension 41, the suspension 41 can be recovered continuously after the suspension 41 is ejected, so that it can be efficiently performed.
[0032]
Next, when the suspension 41 is discharged from the outer tube 16, as shown in FIG. 2 (c), while the outer tube 16 is rotated around the tube axis A in the Y direction, the extending portion 18 is simultaneously lowered. Rotate around the Z direction (direction perpendicular to the tube axis A) so that the side is upside down. Then, with the extending portion 18 in the lower position, as shown in FIG. 2D, the outer tube 16 is rotated around the tube axis A in the Y direction while blowing warm air from the outside of the outer tube 16. Then, the suspension 41 in the container part 17 is dried. Thereby, a protective layer is formed on the inner surface of the outer tube 16. During the drying of the suspension 41, the suction nozzle 42 is inserted into the outer tube 16 and the steam generated from the suspension 41 is sucked and exhausted.
[0033]
Further, since the outer tube 16 is turned upside down before the drying, while the outer tube 16 is rotated around the tube axis A, the suspension 41 remaining in the container portion 17 bottoms its inner surface during the turning. Instead of flowing in a straight line from the side toward the opening 17a, it flows evenly over a wide range.
Thereby, the thickness of the suspension 41 applied in the container part 17 can be made substantially uniform. Further, since the reservoir portion 19 as shown in FIG. 1 is formed in the outer tube 16, the suspension 41 that hangs down from the bottom of the container portion 17 to the extending portion 18 along the inner surface is retained in the reservoir portion 19. And does not flow (sag) into the extending portion 18 as in the prior art.
[0034]
Moreover, since the outer tube 16 rotates around the tube axis A at a predetermined rotational speed, the suspension 41 in the container portion 17 stays on the inner surface above the opening 17a of the container portion 17 due to centrifugal force and moves downward. It is difficult to flow into.
As for the outer tube | pipe 16 in which the protective layer was formed as mentioned above, a fluorescent layer is formed on a protective layer. Finally, in the state where the inner tube is inserted into the outer tube 16 so that the bottom of the inner tube 15 comes from the opening 18a of the extending portion 18 of the outer tube 16, the extension portion 18 of the outer tube 16 The light emitting bulb 12 is formed by sealing the end of the inner tube 15 opposite to the bottom of the inner tube 15 at a predetermined position and cutting off an extra portion of the extending portion 18 of the outer tube 16. Although not described, a protective layer and a fluorescent layer are also formed on the outer periphery of the inner tube 15, and a rare gas, mercury, or the like is enclosed in the light emitting bulb 12.
[0035]
In the above-described manufacturing process of the light-emitting bulb 12, particularly in the step of forming a protective layer on the inner surface of the outer tube 16, the suspension in the outer tube 16 with the opening 18a of the extending portion 18 of the outer tube 16 facing down. Although the outer tube 16 is dried, the reservoir portion 19 is formed in the outer peripheral portion of the opening 17 a of the container portion 17 in the outer tube 16, so that the suspension 41 that hangs down along the inner surface of the container portion 17. Is accumulated in the reservoir portion 19 and the protective layer suspension 41 flows into (attaches to) the extending portion 18 of the outer tube 16, particularly the portion to be sealed with the end portion of the inner tube 15 (the portion to be sealed). There is no.
[0036]
For this reason, the conventional removal process of the protective layer (alumina particles) adhering to the extending portion 18 becomes unnecessary, and the productivity can be improved. Moreover, since the protective layer suspension 41 does not adhere to the extending portion 18, there is no possibility that the alumina particles melt into the molten glass when sealed with the inner tube. Therefore, the reliability of the sealing part 13 can be remarkably improved.
[0037]
3. Lamp performance
In the electrodeless lamp 10 having the above-described configuration, a plasma discharge is formed by mercury and an enclosed gas (Hg + Kr) enclosed in the light emitting bulb 12 by flowing a high-frequency excitation current from the high-frequency drive circuit 30 to the excitation coil 22. By this discharge, ultraviolet rays are emitted from the mercury, and the fluorescent layer formed on the inner surface of the light emitting bulb 12 is excited by the ultraviolet rays to generate visible light.
[0038]
As described above, the electrodeless lamp 10 having the reservoir portion 19 in the light emitting bulb 12 and having the fluorescent layer formed on the inner surface thereof emits more light when the lamp is lit than the electrodeless lamp having no reservoir portion 19. The luminous flux is improved.
That is, in the step of forming the fluorescent layer, when the applied suspension for the fluorescent layer is dried, it is performed with the opening 18a of the extending portion 18 of the outer tube 16 down, so that the reservoir portion 19 is flat. Suspension accumulates on the inner surface of the portion 19a. As a result, the fluorescent layer formed on the inner surface of the reservoir portion 19 is thicker than the fluorescent layers in other portions. Thereby, visible light excited by ultraviolet rays can be increased.
[0039]
In addition, when forming the fluorescent layer, the opening 18a of the extending portion 18 is faced down when drying after applying the suspension for the fluorescent layer so that the fluorescent layer at the head of the outer tube 16 is not thickened. Yes. When the fluorescent layer on the head becomes thick, the visible light transmittance at the head deteriorates, and when the electrodeless lamp 10 is turned on, the illuminance directly below the lamp may be reduced. Hereinafter, the difference in the luminous flux when the lamp is lit depending on the presence or absence of the reservoir portion 19 on which the fluorescent layer is formed will be described. The structure of the electrodeless lamp is the same, and an electrodeless lamp (hereinafter referred to as “invention product”) in which the reservoir portion 19 is formed in the light emitting bulb 12 and a conventional lamp in which the reservoir portion 19 is not formed ( Hereinafter, the luminous flux was measured when both were turned on.
[0040]
Here, the configurations of the invention and the conventional product used for the measurement will be described.
The product of the invention and the conventional product have the same configuration, and the different part is the presence or absence of the reservoir 19 described above. Therefore, both will be described with reference to FIG. 1 for convenience. The light emitting bulb 12 has a maximum outer diameter D of 65 mm and a total length L of 71 mm. In FIG. 1, the fluorescent layer at the B position has a thickness of about 15 μm, and the C position has a thickness of 18 μm. Both are almost the same thickness. Further, in the product of the present invention, the thickness at the E position in FIG. 1 is 80 μm, whereas the thickness of the position of the conventional product corresponding to the E position of the product of the present invention (G in FIG. 3 (d)) is 23 μm. In addition, the width F of the flat part 19a in the reservoir 19 of the invention is 8 mm. The other configurations, for example, the high-frequency drive circuit, the excitation coil, and the inner tube dimensions are the same.
[0041]
Each of the inventive product and the conventional product was lit with the base facing up. At this time, the luminous fluxes of the both products are about 760 lm for the inventive product and about 710 lm for the conventional product, and the luminous flux of the inventive product is increased by 50 lm (7%) with respect to the conventional product.
The lamp bulb used for the above measurement of the luminous flux had a maximum outer diameter D of 65 mm. In order to confirm whether the luminous flux is improved even if the size of the luminous bulb is changed, The maximum outer diameter D of the light emitting bulb is changed to 70 mm, and the second invention product having a reservoir portion and the second conventional product having no reservoir portion are manufactured (the other configurations are the above-described invention products and conventional products). The same luminous flux was measured. As a result, it was confirmed that the second invention product increased by 5% with respect to the second conventional product.
[0042]
From these results, regardless of the size (maximum outer diameter) of the outer tube, the reservoir 19 is formed in the outer tube 16, and the thickness of the fluorescent layer formed on the flat portion 19a of the reservoir 19 is changed to other values. It is considered that the luminous flux is improved by making it thicker than the portion (for example, the B position and the C position). Note that, by increasing the thickness of the fluorescent layer of the flat portion 19a, visible light generated from the inner surface of the reservoir portion 19 increases, but conversely, visible light transmitted through the reservoir portion 19 decreases. However, since the reservoir 19 is hidden in the case 28, there is no problem even if the visible light transmitted through the reservoir 19 is reduced.
[0043]
On the other hand, comparing the measurement results of the inventive product using the light emitting bulbs having different maximum outer diameters D of the outer tube 16 and the second invention product, the maximum outer diameter D of the outer tube 16 is increased (65 mm → 70 mm). Then, the increase ratio (7% → 5%) of the luminous flux of each invention product with respect to each conventional product is small.
In the above measurement, since the size (area) of the flat portion 19a of the reservoir portion 19 is made constant and only the maximum outer diameter D of the outer tube 16 is increased, the flat portion with respect to the maximum outer diameter D of the outer tube 16 is increased. It is considered that the proportion of the size of 19a is reduced and the increase rate of the luminous flux is also reduced. Therefore, regardless of the diameter of the outer tube 16, it is considered that if the area of the flat portion 19a is increased, the luminous flux at the time of lighting increases.
[0044]
4). Other
1) Rotational speed of the outer tube during drying
When drying the suspension 41 for the protective layer, if the rotation speed of the outer tube 16 is high, the suspension 41 is approximately centered in the tube axis A direction of the outer tube 16 by centrifugal force, that is, the outer tube 16. The outer diameter of the material gathers at the portion where the outer diameter is maximum, and the protective layer of that portion becomes thick. On the other hand, when the rotation speed is low, the protective layer on the lower side of the container portion 17 becomes thick.
[0045]
On the other hand, visible light generated when the lamp is turned on is less likely to be transmitted as the protective layer is thicker. In general, the lamp is often lit with the base on top, and it is preferable that the visible light emitted from the lamp is large on the lower side of the light emitting bulb (on the side opposite to the base) because the illuminance directly below the lamp increases. .
From this, it can be said that the rotation speed of the outer tube 16 is preferably a speed at which the suspension 41 is accumulated below the opening 17 a of the container portion 17. Note that the rotation speed of the outer tube 16 is determined by the viscosity of the suspension 41 for the protective layer, the drying temperature, and the like. The rotational speed is determined.
[0046]
2) About application nozzle
The application nozzle 40 in the above embodiment is configured to eject the suspension 41 in four directions, but is not limited to four directions. For example, even if it ejects only in one direction, the suspension 41 can be uniformly applied by adjusting the rotation speed and time of the outer tube 16. However, it goes without saying that the suspension 41 can be efficiently applied when ejected in a plurality of directions.
[0047]
Further, the application nozzle 40 may simply be configured to simply allow the suspension 41 to flow into the outer tube 16. In other words, when the suspension 41 of the protective layer is applied to the inner surface of the outer tube 16, the outer tube 16 does not adhere to the planned sealing site (sealing part 13) with the inner tube 15. What is necessary is just to be able to flow the suspension 41 into the inside.
The application nozzle 40 has a function of ejecting the suspension 41 and sucking and discharging (collecting) it. For example, the suspension 41 is ejected using a dedicated ejection nozzle, and the suspension 41 A dedicated suction / discharge nozzle may be used for collection. Even in this case, the suspension 41 can be applied and discharged without adhering the suspension 41 to the site to be sealed with the inner tube 15, and after the suspension 41 has been dried, The removal process of the protective layer (suspension) adhering to 18 can be eliminated.
[0048]
(Modification)
Although the present invention has been described based on the embodiments, the content of the present invention is not limited to the specific examples shown in the above embodiments, and for example, the following modifications are implemented. can do.
1. About the bulb shape
In the above embodiment, the light-emitting bulb has a shape that is an A shape. This is because, for example, a case where it is used as an alternative to an existing incandescent bulb or a bulb-type fluorescent lamp is assumed. Therefore, even if the shape of the light emitting bulb is, for example, a G shape, a D shape, or a T shape, it can be implemented in the same manner as in the above embodiment.
[0049]
2. About the shape of the reservoir
In the above embodiment, the reservoir portion has a flat portion formed in a direction substantially perpendicular to the tube axis of the outer tube, but may have other shapes. In other words, as described in the above manufacturing method, the shape of the reservoir portion stores the suspension that hangs down the inner surface of the outer tube when the opening of the outer tube faces downward when drying the suspension. Any shape that can prevent the suspension from flowing into the site to be sealed with the inner pipe downstream (lower side) may be used.
[0050]
As an example of this, in the reservoir portion in the embodiment, the end portion on the sealing portion side is substantially orthogonal to the tube axis A, but the end portion on the sealing portion side approaches the tube axis. Therefore, the flat portion in the embodiment may be recessed (in a groove shape over the entire circumference) so as to enter the inside. In order to form such a concave shape, an outer tube valve is formed in the same manner as in the prior art, and then the flat portion of the reservoir is heated and softened, and a molding jig or the like corresponding to the concave shape is pressed from the outside. What is necessary is just to shape | mold.
[0051]
In this way, even if the reservoir is concave, even if the suspension for the protective layer is applied and discharged in the outer tube and then the outer tube is inverted, the suspension remaining in the outer tube is not Even if it hangs down along the inner surface, it accumulates in the reservoir portion, so that it does not flow into the sealing portion (extended portion) with the inner tube.
When the reservoir is concave, it may be “V” -shaped, and may be “shi” -shaped.
[0052]
3. About the sealing part
In the above-described embodiment, the end portion of the inner tube is formed so as to spread outward, and the tip end portion is sealed to the extending portion of the outer tube. The shape may be changed and sealed. As an example in which such a shape is changed, the reservoir portion of the outer tube is further extended inward, and the end portion on the opening side of the inner tube is formed into a straight tube without spreading outward, and the end portion of the reservoir portion and the inner tube You may seal with the edge part. That is, a reservoir portion may be formed at the periphery of the opening of the outer tube, and the periphery of the opening and the inner tube may be sealed.
[0053]
In the present invention, the position of the reservoir is determined by the sealing position between the inner tube and the outer tube, the shape of the outer tube near the sealing position, and the like. In other words, in the embodiment, the reservoir portion is separated from the sealed portion, while the reservoir portion may start from the sealed portion as in the modification in this section. Therefore, the term “near the sealing part” in the present invention includes the case where the sealing part is the end of the reservoir part, as described above, when it is slightly separated from the sealing part.
[0054]
4). Suspension application
In the above embodiment, when the protective layer is formed, that is, when the suspension is applied and then dried, the opening of the outer tube is directed upward or downward. The tube axis of the outer tube at this time coincides with the direction in which gravity acts (hereinafter referred to as “vertical axis”), but the tube axis of the outer tube may be inclined with respect to the vertical axis.
[0055]
That is, when the suspension is ejected from the application nozzle toward the inner surface of the outer tube ((a) in FIG. 2), the suspension accumulated in the outer tube after the ejection is not applied to the application planned portion on the inner surface of the outer tube. The outer tube can be inclined to the extent that it does not exceed. On the other hand, after the suspension in the outer tube is discharged, when the outer tube is inverted and its opening faces downward, the suspension that hangs down along the inner wall of the outer tube accumulates on the part of the reservoir. Can be tilted to a degree.
[0056]
Therefore, in the present invention, “the state in which the opening of the outer tube is upward” or “downward” does not mean only the state in which the tube axis of the outer tube coincides with the vertical axis, but as described above. The state in which the tube axis of the outer tube is inclined with respect to the vertical axis is also included.
[0057]
【The invention's effect】
As described above, the light emitting bulb according to the present invention is sealed at the peripheral portion of the opening in a state where the inner tube is inserted into an outer tube having an opening and a protective layer formed on the inner surface. A light-emitting bulb for an electrodeless lamp, wherein the outer tube has a drooping protective liquid reservoir portion in the vicinity of the sealing portion and on the protective layer side. When drying after applying the protective liquid, the protective liquid hanging down along the inner surface of the outer pipe can be stored in the reservoir even if the opening of the outer pipe faces downward, and the protective liquid is sealed to the inner pipe. It can be prevented from flowing into the planned site. For this reason, the removal process of the protective layer required with the conventional manufacturing method can be skipped, and productivity can be improved.
[0058]
Further, according to the method for manufacturing a light emitting bulb according to the present invention, the inner tube is sealed in the peripheral portion of the opening in the state where the inner tube is inserted into the outer tube having an opening and a protective layer formed on the inner surface. A method of manufacturing a light emitting bulb for an electrodeless lamp, wherein the outer tube has a reservoir portion in the vicinity of the sealing portion and on the side where the protective layer is to be formed. The protective layer is formed on the inner surface of the pipe by applying a suspension for the protective layer to the inner surface, and the suspension hanging from the inner surface of the outer pipe with the opening of the outer pipe facing downward. For example, when the suspension is applied to the inner surface of the outer tube and then dried, the opening of the outer tube is directed downward. The suspension that hangs down along the inner surface of the outer tube can be stored in the reservoir, and the suspension It can be prevented from flowing into wearing the proposed site.
[Brief description of the drawings]
FIG. 1 is a front view showing an overall configuration in which a part of an electrodeless fluorescent lamp according to an embodiment of the present invention is cut away.
FIG. 2 is a diagram illustrating a process of forming a protective layer on the inner surface of the outer tube in the embodiment of the present invention.
FIG. 3 is a diagram illustrating a conventional process for forming a protective layer on the inner surface of an outer tube.
[Explanation of symbols]
10 lamps
12 Light bulb
13 Sealing part
15 outer pipe
16 Inner pipe
17 Container
18 Stretched part
19 Reservoir
19a flat part

Claims (6)

A method of manufacturing a light-emitting bulb for an electrodeless lamp, wherein an inner tube is inserted into an outer tube having an opening and a protective layer is formed on the inner surface, and the inner tube is sealed to the peripheral edge of the opening. ,
In the outer tube, a reservoir is formed in the vicinity of the sealing portion and on the side where the protective layer is to be formed,
Formation of a protective layer on the inner surface of the outer tube,
Applying a suspension for the protective layer to the inner surface;
Sucking and discharging the suspension after application with the opening facing upward;
And the step of drying the applied suspension while storing the suspension that hangs down the inner surface of the outer tube with the opening of the outer tube facing downward. A method of manufacturing a light emitting bulb for a lamp. 2. The method of manufacturing a light-emitting bulb for an electrodeless lamp according to claim 1, wherein the drying step is performed while rotating the outer tube around its tube axis. The upside down of the outer tube when moving from the step of discharging the suspension to the step of drying the suspension is performed while rotating the outer tube about its tube axis. A method for producing a light-emitting bulb for an electrodeless lamp according to 1 or 2 . Discharging a coating of the suspension has a function for ejecting a suspension, in any one of claims 1-3, characterized in that is carried out by a nozzle having a function of sucking and discharging the suspension The manufacturing method of the light emission bulb | bulb for electrodeless lamps of description. In an electrodeless lamp having a light emitting bulb that is sealed at the periphery of the opening in a state where the inner tube is inserted into the outer tube having an opening and a protective layer formed on the inner surface,
In the outer tube, a reservoir is formed in the vicinity of the sealing portion and on the side where the protective layer is to be formed,
The said light emitting bulb is manufactured by the manufacturing method of any one of Claims 1-4, The electrodeless lamp characterized by the above-mentioned. The fluorescent layer is formed on the inner layer of the protective layer and the inner surface of the fastening portion, and the thickness of the fluorescent layer of the fastening portion is thicker than that of the fluorescent layer formed in another portion. Electrodeless lamp.

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