JP2002352776A - Production method of colored light bulb - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method capable of producing a colored light bulb, which is superior in heat resistance and UV-ray resistance and the like and has a colored layer on the bulb surface. SOLUTION: A colored coating material 4c in a state with a low-melting point glass powder is applied to the wall surface of a light bulb 13, located upright and sealed at either end by spouting of a nozzle 4b at a constant pressure, and drying processes 5, 6, 7 are examined by exposing the whole applying area to warm air, with this colored coating material 4c applied to. Then the opening side neck area of the bulb 13, with the colored coating film examining the drying processes 5, 6, 7, is cleaned for removal, an electrode mount with an exhaust pipe is inserted and located from the opening side of the bulb 13 examining the removal cleaning 8. Afterwards, a glass of the electrode mount inserted and located in the bulb and a cleaning part of th light bulb are fused to seal, and the exhaust pipe is sealed, after the inside of the light bulb is exhausted via the exhaust pipe of the electrode mount.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a colored light bulb, and more particularly, to a method for manufacturing a colored light bulb in which restrictions on the use environment are greatly reduced.

[0002]

2. Description of the Related Art The use of light bulbs has been diversified for lighting or display. Further, in diversification of this use, use with color rendering properties is increasing. However, there is a limit in the expression color or color rendering of the light bulb itself. Therefore, when performing various expressions, the light bulb or the lighting fixtures are supplemented with various ideas by applying various measures.

For example, (a) a light-transmissive colored ink layer is formed on the outer peripheral surface of a bulb, (b) a translucent colored cap is fitted on the outer peripheral surface of the bulb, and (c) a pigment is contained. Forming a bulb bulb with translucent colored glass,
Alternatively, (d) a configuration is adopted in which a filter or a colored cover is arranged on the light projection surface of lighting equipment. In addition,
When a bulb is provided with diversification means, generally, the utilization ratio of visible light (visible light) of the bulb is about 10%, about 80% is infrared radiation, and about 10% is loss.

[0004] By the way, the above-mentioned means for diversification needs to sufficiently consider the influence of the surroundings, such as the temperature of the use environment, while assuming the problem of light transmission. For example, the temperature of the bulb surface is generally determined by the power consumption (W) of the bulb and the distance from the light source (filament). Therefore, in the case of bulbs having the same shape and dimensions, the power consumption of the bulb ( The larger the value of W), the higher the surface temperature. Therefore,
Small light bulbs with low power consumption (W) are mainly targeted for diversified light bulbs. The translucent colored ink and the colored cap are usually made of a silicone resin or a melamine resin.

[0005]

However, (a) a structure in which a translucent colored ink layer is provided on the outer peripheral surface of the bulb, (b) a structure in which a translucent colored cap is fitted, or (d) ) In a configuration in which a filter or the like is arranged on the light projection surface of lighting equipment, there is a limit to the heat resistance of the coloring material, so that use under conditions that are easily affected by heat or the like is restricted. That is, silicone resin and melamine resin
All have problems in heat resistance and ultraviolet resistance.

[0006] Further, since the coloring material is deteriorated due to thermal influence or exposure to ultraviolet rays, and may not be able to sufficiently perform a required function, the use environment considering heat resistance and ultraviolet resistance is considered. Or use conditions. When a configuration in which a colored ink layer is provided on the inner wall surface of the bulb is adopted as a modified embodiment of (a), when the inner wall surface of the colored bulb is a small diameter of 2 to 30 mm, spraying or flowing coating is performed. It is difficult to form a uniform coating film,
As a result, it becomes a colored film in which color unevenness, liquid dripping, and streaks are generated, which causes a decrease in quality or a decrease in yield.

On the other hand, when the bulb is formed from (c) translucent colored glass as a material, restrictions on the use conditions due to the above-mentioned thermal influence can be greatly improved. By the way, since this kind of colored bulb is a so-called multi-product, small-volume product, there is a problem in the production and storage of colored glass (material) or colored bulb. That is, colored glass (material)
In the preparation of and the production of a tube having a required diameter, production and production of a certain amount or more is desired from the viewpoint of productivity and cost.

However, colored bulbs, which are many kinds and small quantities of products, generally require an outer diameter dimension and a colored glass bulb corresponding to each kind, and colored glass bulbs are not general-purpose. Inevitably, inventory and storage must be adopted. In the case where the colored glass bulb is converted into a corresponding colored light bulb, a part other than the supplied one is stored as a stock.

As described above, in the case of the conventional means for producing a colored light bulb, there are problems such as restrictions on the use and environment of use of the product, quality and yield of the product, and productivity or production cost. In response to this type of expanded use of colored light bulbs, diversification, and diversification, development of means for efficiently producing high-quality colored light bulbs with high productivity, high yield, and excellent durability. Practical use is awaited.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and efficiently provides a colored light bulb having a uniform or uniform colored layer having excellent heat resistance and ultraviolet light resistance on the inner wall surface or outer peripheral surface of the bulb. It is intended to provide a manufacturing method that can be manufactured.

[0011]

According to the first aspect of the present invention, a colored coating material containing a low-melting glass powder is provided at a constant pressure on an inner wall surface or an outer peripheral surface of a bulb bulb having one end sealed substantially vertically disposed. A step of applying by spraying, and a step of performing a drying process by exposing the entire application region to substantially uniform warm air in an upright state where the colored coating material is applied, and of the colored coating film formed by the drying process, Selectively removing and cleaning the opening-side neck region of the bulb bulb; inserting and positioning an electrode mount with an exhaust pipe from the aperture side of the selectively removed and cleaned bulb bulb; Fusing and sealing the determined electrode mount glass and the cleaning portion of the bulb bulb; and cleaning the interior of the bulb bulb through the exhaust pipe of the electrode mount. After the gas is a method for producing a colored bulb, characterized in that it comprises a step of sealing the exhaust pipe.

According to a second aspect of the present invention, in the method for producing a colored light bulb according to the first aspect, the low melting point glass powder in the colored coating material has a melting point of 350 to 370 ° C. and an average particle size of 40 μm.
It is characterized by the following glass powder.

According to a third aspect of the present invention, in the method for manufacturing a colored light bulb according to the first or second aspect, the medium in the colored coating material is a low-viscosity organic solvent having a temperature of 60 to 80 °. I do.

According to a fourth aspect of the present invention, in the method for producing a colored light bulb according to any one of the first to third aspects, the maximum diameter of the bulb for a bulb is 2 to 30 mm.

According to a fifth aspect of the present invention, in the method for manufacturing a colored bulb according to any one of the first to fourth aspects, the first drying treatment of the colored coating material of the bulb is performed by heating the bulb from above and below. It is characterized by being performed by exposing to the wind.

The inventions of claims 1 to 5 are carried out in accordance with a usual method of manufacturing a light bulb, for example, by a turntable method for grasping / separating an object to be processed and performing a required processing while commercializing the product. You. That is, for example, an eggplant-shaped bulb made of non-colored glass and having a maximum outer diameter (inner diameter) of 2 to 28 mm and an overall length of about 5 to 50 mm with one end sealed in a substantially hemispherical shape is prepared. Then, the eggplant-shaped bulb is set almost upright with its opening downward, and in this state, the inner wall surface or the outer peripheral surface is previously cleaned with washing water, and then the inner wall surface of the eggplant-shaped bulb is set. Alternatively, a colored coating material is applied to the outer peripheral surface by jetting a nozzle at a constant pressure.

Here, the non-colored glass is, for example, borosilicate glass, quartz glass, etc., and the colored coating material is, for example, a low-melting glass powder having a melting point of about 350 to 370 ° C., such as lead borosilicate glass. , Blue inorganic pigment (TF500H blue, trade name, manufactured by Okuno Pharmaceutical Co., Ltd.), green inorganic pigment (TF300H green, trade name,
Inorganic pigment powder such as Okuno Pharmaceutical Co., Ltd.), an organic vehicle component such as a cellulose resin, and a low-viscosity dispersion medium having a viscosity of about 60 to 80 ° such as pine oil, carbitol, and methanol are essential components. . The essential component ratio of the colored coating material is such that the low melting glass powder 8
0 to 85 parts by weight, 20 to 30 parts by weight of an inorganic pigment powder, 1 to 5 parts by weight of an organic vehicle component, and about 10 to 15 parts by weight of a dispersion medium, which are prepared so as to satisfy properties that can be ejected from an ejection nozzle. You.

In the first to fifth aspects of the present invention, the following means is employed for applying the colored coating material to the inner wall surface or the outer peripheral surface of the bulb for a light bulb whose one end is sealed in a substantially hemispherical shape. That is, the coating material storage tank is sealed, and a mechanism (for example, a magnet stirrer) for stirring the coating material supplied and stored in the storage tank, and a jet nozzle connecting portion are provided.
A configuration is adopted in which the coating material in the storage tank is pressurized.
Here, pressurization of the coating material in the storage tank, in the case of bulbs of the same type of bulb, to ensure uniform application,
Always arrange a plurality of solenoid valves-flow control mass front controller system in parallel so that a constant injection pressure is maintained,
It is performed in a configuration that is easy to control.

The spray nozzle is, for example, a seamless pipe or an injection needle made of stainless steel having an inner diameter of about 0.9 to 2 mm. By forming such a thin nozzle, air bubbles in the coating material can be suppressed. At the same time, it becomes easy to apply by spraying. In addition, injection of coating material
In the application step, it is preferable to provide a recovery mechanism in order to recover the excess coating material flowing down.

In the first to fifth aspects of the present invention, the drying process of exposing the entire application area to warm air in the upright state where the colored coating material is applied is performed as follows. First, by supplying warm air from both directions of the sealing top surface side and the lower opening side of the bulb for a bulb, the bulb is exposed to substantially uniform warm air. Here, the gripping of the bulb is switched to the lower end side to prevent heat from being deprived via the head chuck and causing a temperature difference.

In other words, the temperature difference caused by the thermal conductivity of the head chuck leads to the drying of the gripping portion of the head chuck, leading to uneven drying or uneven coating. Switch the grip to the lower end. Furthermore, when supplying hot air from the direction of the sealing top surface side of the bulb for a light bulb, by controlling the flow so that hot air does not directly hit the sealing top surface, it is possible to more easily avoid the occurrence of drying unevenness. The hot air can be generated by, for example, supplying and circulating dry compressed air through a flow path provided with a heating mechanism, and heating at the stage of the circulating and passing. The temperature, flow rate, and exposure time of the hot air are appropriately set according to the shape and dimensions of the workpiece, the material of the colored coating material, and the like.

In the first to fifth aspects of the present invention, the selective removal cleaning of the neck region on the opening side of the bulb for a bulb with a colored coating film is performed for sealing with an electrode mount. Here, the removal cleaning is performed by, for example, a rotary brush or the like, and is usually set to a width of about 3 to 10 mm, depending on the shape and dimensions of the workpiece.

According to the first to fifth aspects of the present invention, the electrode mount with the exhaust pipe is inserted and positioned in the bulb for the bulb after the selective removal and cleaning, and the inserted and positioned electrode mount is fused and sealed to the bulb for the bulb. Wear
Processes such as exhausting the bulb inside the bulb through the exhaust pipe of the electrode mount, sealing the exhaust pipe after the exhaust, and attaching the terminal base are performed in the same manner as in the case of a normal bulb.

According to the first to fifth aspects of the present invention, the diversification of the electric bulb is performed by applying a colored coating material containing low-melting glass as a binder component. In other words, since the coating is performed by spraying the colored coating material at a constant pressure, uneven coating and the like are eliminated, and the entire surface is dried by being exposed to substantially uniform warm air, so that a uniform hue can be easily and reliably formed. Granted. In addition, since the coloring layer is an inorganic material and has excellent heat resistance and ultraviolet resistance, restrictions such as a use state and a temperature of a use environment are largely eliminated, and the versatility of the colored bulb is enhanced.

Further, since the bulb for a light bulb can be made of a general glass pipe, it is possible to avoid the complexity and cost increase of the storage of the material and the like, and it is possible to efficiently manufacture a large variety of small-quantity products. Can respond.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS. 1, 2, 3, 4, 5, and 6. FIG. FIG. 1 is a plan view illustrating a schematic configuration of a turntable type coating apparatus that performs a step of applying a coloring coding material to an eggplant-shaped bulb in the method for manufacturing a colored bulb according to the embodiment. In FIG. 1, reference numeral 1 denotes a setting position of an eggplant-shaped bulb, 2 denotes a detecting section of the eggplant-shaped bulb, 3 denotes a cleaning section of the inner wall surface of the eggplant-shaped bulb, and 4 denotes a coating section of a colored coding material. Here, the coating part 4 of the coloring coding material is partially cut out in FIG. 2 to partially cut the outline of the configuration, and FIG.
It has a configuration that is partially cut away and shown sideways.

That is, the washed eggplant-shaped bulb 1
3, an injection nozzle 4b inserted into the eggplant-shaped bulb 13 held by the gripping head 4a at a distance of about 10 mm from the sealing inner wall surface, and the injection nozzle 4b , A coding material supply pipe 4e for pressure-feeding the coding material 4c from the coding material tank 4d, a coding material receiving container 4f for receiving the coding material 4c flowing down by fitting into the opening side of the eggplant-shaped bulb 13; A coding material collecting pipe 4g connected to the receiving container 4f to collect the coding material 4c, a cover 4h for shielding / interioring the coding material collecting pipe 4g from the outside, an injection nozzle 4b, a coding material supply pipe 4e, etc. are moved up and down. The coding material coding unit 4 is constituted by an air cylinder 4i to be formed.

The coating material tank 4d is provided with a stirring mechanism such as a magnet stirrer for stirring the stored coding material 4c, and a pressure gauge 4k is provided for pressure-feeding and controlling the coding material 4c at a constant pressure. It is attached. Also, the coating material tank 4
The pressure in d is, for example, compressed air is supplied to a plurality of rows of solenoid valves 41
-A configuration is adopted in which the flow can be adjusted while finely adjusting the flow rate with a 4 m mass flow controller.

Reference numerals 5, 6, and 7 denote a drying section and 8 denotes a neck cleaning section. Here, the drying processing unit 5,
6 and 7 are set in three stages, and the drying section 5
The preliminary drying stage and the drying processing units 6 and 7 are a full-scale drying stage.

First, the drying section 5 includes the coating material 4
The configuration is such that hot air for drying is blown from above and below so that the spray applied area of the eggplant-shaped bulb 4 to which c has been spray applied is almost uniformly exposed to the hot air. That is, as shown in a side view in FIG. 4, a schematic configuration is supplied through a flow meter.
Pressurized hot air heated to about 0 ° C. is applied to the eggplant-shaped bulb 4 through a hot-air nozzle 5 a provided with a plurality of ejection holes almost uniformly on the hemispherical sealing surface side of the eggplant-shaped bulb 4. The outer peripheral surface of the valve 4 is uniformly exposed. On the other hand, pressurized hot air heated to, for example, about 200 to 250 ° C. is also blown to the opening side of the eggplant-shaped bulb 4 in the distribution / supply process through the similar hot air nozzle 5b. These hot air nozzles 5a and 5b are driven by up and down driving mechanisms (eg, air cylinders) 5c and 5c.
By d, it comes in contact with and separates from the eggplant-shaped bulb 4. In the drying section 5, the holding of the eggplant-shaped bulb 4 is switched from the holding head 4a to the holding of the opening end by the air chuck 5e.

The drying processing sections 6 and 7 perform final drying processing, and are mainly performed by blowing hot air to the opening side of the eggplant-shaped bulb 4. That is, the drying processing unit 6,
As shown schematically in FIG. 5, numeral 7 denotes an eggplant-shaped bulb 4 at an opening side, for example, at 30 ° intervals on the bulb circumferential surface.
The tip of the hot air discharge nozzle 6a having a hole with a diameter of 1 mm is inserted and arranged, and pressurized hot air at about 400 to 450 ° C. is supplied. The process is continued and the drying proceeds.

In the drying sections 6 and 7,
The eggplant-shaped bulb 13 is held by the eggplant-shaped bulb 13.
Is gripped by the gripping head 6a (7a). In addition, it is desirable that the hot air discharge nozzle 6 a on the opening side of the eggplant-shaped bulb 13 blows out hot air from the position where the tip is inserted and arranged to immediately before it descends to the opening end of the eggplant-shaped bulb 13. . In other words, if the hot air is blown out before or after the lower end of the eggplant-shaped bulb 13 is opened, uneven coloring may occur.

As shown schematically in FIG. 6, the neck cleaning section 8 faces the opening side of the eggplant-shaped bulb 13 gripped by the gripping head 8a and faces the opening end side. The rotary polishing plate 8 is provided with a rotary drive mechanism 8c for rotating and driving the rotary polishing plate 8b, which holds the rotary polishing plate 8 which can be moved forward and backward.

Further, reference numeral 9 denotes an inspection section of the eggplant-shaped bulb bulb which has been subjected to a coloring treatment, 10 denotes an idle (blank space), 11 denotes a take-out section, and 12 denotes a center take-out section. Here, the bulb bulb inspection unit 9 and the idle 1
0, bulb bulb take-out part 11, and center take-out part 1
The configuration and function of 2 are almost the same as those of a turntable system for manufacturing an ordinary light bulb.

Next, a specific example will be described.

First, a total length 48 in which one end is sealed in a hemispherical shape.
mm, the length of the large diameter part 30 mm, the outer diameter of the large diameter part 20 mm,
An eggplant bulb 13 having an opening-side reduced diameter portion having a length of 18 mm and an outer diameter of the reduced diameter portion of 16 mm was prepared. Next, the eggplant-shaped bulb 13 is set on the gripping head 4a, and the bulb detection unit 2 destructively detects whether or not it is a standard product, whether or not there is damage. The holding of the eggplant-shaped bulb 13 by the holding head 4a is performed by holding the large-diameter portion on the sealing side. After that, the process is moved to the valve inner wall surface cleaning section 3, in which pressurized water is injected to the valve inner wall surface to perform a cleaning process, and then compressed air is blown to the valve inner wall surface to be dried.

The thus-purified eggplant bulb 1
3 is transferred to the coating section 4, and the coating material 4c pressurized to a constant pressure via the spray nozzle 4b is spray-coated on the inner wall surface. Here, the coating material 4c, for example a blue inorganic pigment _{(CoO-Al 2 O 3)} 20~25
Parts by weight are prepared by mixing 60 to 85 parts by weight of a lead borosilicate glass powder having an average particle size of 40 μm or less, 10 to 15 parts by weight of pine oil, and 1 to 5 parts by weight of a cellulose resin. Alternatively, a green inorganic pigment (CoO-
_{Al 2 O 3 -Cr 2 O 3} -MgO) 25~30 parts by weight,
Lead borosilicate glass powder 70 to 7 having an average particle size of 40 μm or less
5 parts by weight, 1 to 5 parts by weight of a carbitol solvent, and 0.5 to 1.0 part by weight of a cellulose resin are mixed and prepared as components.

The spray coating of the coating material 4c is carried out in a coating material tank 4d by a plurality of rows of solenoid valves 41
-Compressed air is supplied while finely adjusting the flow rate through the mass flow controller 4m, the coating material 4c is placed under a constant pressure, and the coating material 4c is jetted from the jet nozzle hole at a constant pressure. Here, the coating material 4c
In the spray coating, a constant spray coating is performed by keeping the pressure applied to the coating material 4c constant in the coating material tank 4d. In the spray coating of the coating material 4c, the tip of the spray nozzle 4b is 10 mm from the sealing inner wall surface of the eggplant bulb 13.
When the spray coating is performed only at the fixed position and the spray nozzle 4b is moved up and down, the spray coating of the coating material 4c is not performed.

After the spray coating of the coating material 4c is completed, the eggplant-shaped bulb 13 is moved to the drying section 5 and the air chuck 5e is moved from the gripping side of the sealing side by the gripping head 4a.
Is switched to gripping of the opening / diameter-reduced portion. And
The inner wall surface of the eggplant-shaped bulb 13 coated with the coating material, and the non-coated outer peripheral surface are exposed to the entire and uniform hot air by the hot air blown from both the upper and lower directions,
Preliminary drying without drying unevenness is performed. In addition, the flow of the coating film of the coating material is suppressed by the tentative drying process, and there is no fear of occurrence of color unevenness.

Next, the eggplant-shaped bulb bulb 1 subjected to the temporary drying treatment
3 is sequentially transferred to the drying processing sections 6 and 7, and the eggplant-shaped bulb 13 is heated by the hot air blown from the opening end direction.
The drying process of the inner wall surface is advanced. In other words, this drying process is performed centering below the central portion of the eggplant-shaped bulb 13 and, if the position and interval of the hot air discharge nozzles 6a are appropriately set, more efficient and good quality can be achieved. A colored coating film can be formed. At this stage of the drying process, the eggplant-shaped bulb 13 is opened and closed by the air chuck 5e.
Take the form of gripping the reduced diameter portion.

The eggplant-shaped bulb 13 which has been subjected to the required drying treatment and which has been colored is transferred to the neck cleaning unit 8 where the neck cleaning is performed. That is, the gripping of the eggplant-shaped bulb 13 is switched from the gripping by the air chuck 5e to the gripping by the gripping head 8a. The coating film is selectively removed in a ring shape, and the inner wall surface of the eggplant-shaped bulb 13 is exposed.

Next, the eggplant-shaped bulb 13 having undergone neck cleaning is transferred to the inspection section 9 and inspected by a non-destructive inspection means for external appearance, breakage, etc., and classified into non-defective / defective products. It is taken out at 11. Thereafter, a colored bulb can be obtained by conventional sealing of the electrodes, exhausting of the bulb for the bulb, sealing of the exhaust pipe, mounting of the bulb base, and the like.

In the above description, an example of manufacturing a colored light bulb using an eggplant-shaped bulb bulb sealed with a flare bulb has been described. However, a colored light bulb of a wedge base lamp or a bead seal type can be similarly implemented. . Also, the spray coating of the coating material can be performed on the outer peripheral surface of the bulb for a bulb. In other words, the colored film is usually provided on the inner wall surface of the bulb for a light bulb, but for example, it is also possible to adopt a means in which the tips of a plurality of spray nozzles are arranged to extend toward the sealing end surface side and spray-coated from the sealing outer peripheral surface side. Good.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention. For example, the shape and dimensions of the bulb, the material of the bulb, the composition and color of the coating material, etc.
Can be set.

[0045]

According to the first to fifth aspects of the present invention, since the colored film is formed by spraying the colored coating material at a constant pressure, uneven coating can be eliminated. Also, the coating film is
Since it is dried by being exposed to substantially uniform warm air as a whole, a uniform hue is easily and reliably provided. Therefore,
It is possible to easily provide a high-quality colored bulb in response to diversification. In addition, since the coloring layer is an inorganic material and has excellent heat resistance and ultraviolet resistance, restrictions such as a use state and a temperature of a use environment are largely eliminated, and the versatility of the colored bulb is enhanced.

Further, since the bulb for a light bulb can be made of a general glass pipe, it is possible to avoid the complexity and cost increase of storage of the material and the like, and it is possible to efficiently produce a large variety of products in small quantities. Can respond.

[Brief description of the drawings]

FIG. 1 is a plan view showing a schematic configuration of a coding device.

FIG. 2 is a partially cutaway side view showing a schematic configuration of a coding unit.

FIG. 3 is a partially cutaway side view showing an enlarged schematic configuration of a part of a coding unit.

FIG. 4 is a side view illustrating a schematic configuration of a drying processing unit.

FIG. 5 is a side view showing a schematic configuration of another drying processing unit.

FIG. 6 is a side view showing a schematic configuration of a neck cleaning unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Valve setting position 2 ... Valve detection part 3 ... Valve inner wall surface cleaning part 4 ... Coding part 4a ... Grip head 4b ... Injection nozzle 4c ... Coating material 4d ... Coating material tank 4e ... Coating Material supply pipe 4f Coating material receiving container 4g Coating material recovery pipe 4h Cover 4i, 5c, 5d Air cylinder 4k Pressure gauge 4l Solenoid valve 4m Flow control mass pro controller 5,6 , 7... Drying section 5a, 5b, 6b... Hot air nozzle 5e... Air chuck 8... Neck cleaning section 8a... Gripping head 8b. Part 10: Idle 11: Take-out part 12: Center take-out part 13: Eggplant bulb

Claims (5)

[Claims] 1. A step of applying a colored coating material containing a low-melting glass powder to an inner wall surface or an outer peripheral surface of a bulb bulb sealed at one end, which is disposed substantially upright, by spraying a nozzle at a constant pressure; In the upright state in which the coating is applied, a step of subjecting the entire coating area to a substantially uniform warm air to perform a drying process, and selectively opening the neck region on the opening side of the bulb for a bulb among the colored coating films formed in the drying process. Removing and cleaning the electrode mount, and selectively inserting and positioning an electrode mount with an exhaust pipe from the opening side of the selectively removed and cleaned bulb bulb, and removing the inserted and positioned electrode mount glass and bulb bulb. A step of melting and sealing the cleaning unit, and a step of sealing the exhaust pipe after exhausting the inside of the bulb for bulb through the exhaust pipe of the electrode mount. The method of coloring light bulb and having a. 2. The method according to claim 1, wherein the low melting point glass powder in the colored coating material is a glass powder having a melting point of 350 to 370 ° C. and an average particle diameter of 40 μm or less. 3. The medium in the colored coating material is 60 to 80.
2. A low-viscosity organic solvent having a low temperature of 1 °.
Alternatively, the method for producing a colored light bulb according to claim 2. 4. The method for producing a colored light bulb according to claim 1, wherein the bulb has a maximum diameter of 2 to 30 mm. 5. The method according to claim 1, wherein the first drying treatment of the colored coating material of the bulb is performed by exposing the bulb to warm air from above and below. Manufacturing method of colored light bulb.