JPH0562592A - Manufacture of fluorescent lamp - Google Patents

Abstract

PURPOSE:To provide a fluorescent lamp by uniformly forming the film thickness of a suspension, which is applied to the inner surface of a glass bulb followed by drying, in the longitudinal direction of the glass bulb. CONSTITUTION:The suspension of fluorescent material particles is applied to the inner surface of a glass bulb 25. The glass bulb 25 is vertically held in its longitudinal direction. A blast nozzle 22 for sending a predetermined quantity of air is brought in tight contact with the upper end 26 of the glass bulb 25 so as to send air into the inner part of the glass bulb 25. Next, the first blast nozzle 22 is replaced by a next blast nozzle 21 so as to change the quantity of air being supplied to the glass bulb 25. A fluorescent film having uniform film thickness can be formed on the inner surface of the glass bulb without roughening the surface. Difference in chromaticity can be prevented in a fluorescent lamp at the time of lighting.

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 fluorescent lamp in which a glass bulb is coated with, for example, a fluorescent film.

[0002]

2. Description of the Related Art Conventionally, as a method of forming a fluorescent film on a glass bulb by a wet method, a suspension of phosphor particles is applied to the inner surface of the glass bulb, and the longitudinal direction of the glass bulb is held substantially vertical. A method of forming a fluorescent film by blowing air from the upper end of the glass bulb and drying the applied suspension is adopted.

As a method of drying the suspension applied to the glass bulb, for example, as shown in FIG. 2, the glass bulb 2 is arranged slightly apart from the blower nozzle 1 having a predetermined air volume, There is a method of sequentially transporting the glass bulb 2 below the air blowing nozzles 1 having different air volumes by a mechanical index according to the arrow.

However, in this method, since the glass bulb 2 is placed in the blowing air from the blowing nozzle 1, the wind speed is high in the vicinity of the upper end 3 of the glass bulb 2 close to the blowing nozzle 1, and the glass bulb 2 The wind speed becomes slower near the lower end portion 4 of the. For this reason, the suspension is dried down from the upper end portion 3 to the lower end portion 4 of the glass bulb 2 while flowing down the glass bulb 2. Therefore, in the case where the air flow is weak, the thickness of the dried phosphor film is The lower end 4 is thicker than the upper end 3. Particularly in the case of a three-wavelength band emission type fluorescent lamp, if the film thickness of the fluorescent film at both ends of the glass bulb 2 is different, the chromaticity difference at both ends of the fluorescent lamp is large, and color shift may occur. In addition, if the airflow in the initial stage of drying is strong, fine streaks such that the phosphor particles are blown off may occur in the glass bulb 2, and the surface of the phosphor film may be roughened.

Therefore, as shown in FIG. 3, the blowing nozzle 1 is brought into close contact with the upper end portion 3 of the glass bulb 2 so that the wind speed inside the glass bulb 2 is constant with respect to the longitudinal direction of the glass bulb 2. There is a method of drying the suspension applied to the glass bulb 2. In this method, a plurality of air blowing valves 6 are provided in the center valve 5 to which air is sent, and the upper end portion 3 of the glass bulb 2 is brought into close contact with each air blowing valve 6 via an air volume adjusting cock 7. In this method, the clogging of the suspension, which is likely to occur in the glass bulb 2 having a small diameter, does not occur.

[0006]

However, in the method of drying a suspension shown in FIG. 3 described above, the air blowing nozzle 1 for blowing air to one glass valve 2 during the drying step has the suspension applied to this glass valve 2. Since the liquid does not change until it is dried, it is difficult to change the air volume during the drying process. That is, even if the wind speed inside the glass bulb 2 does not change between the upper end portion 3 and the lower end portion 4, if the air flow rate is changed while the blower nozzle 1 is in close contact with the glass bulb 2, the thickness of the dried fluorescent film becomes uniform. This is because it becomes difficult to maintain sex.

The object of the present invention was made in view of the above-mentioned problems, and the film thickness of the suspension applied to the inner surface of the glass bulb and dried is formed uniformly in the longitudinal direction of the glass bulb. It is to provide a method for manufacturing a fluorescent lamp.

[0008]

A method of manufacturing a fluorescent lamp according to claim 1, wherein a suspension is applied to the inner surface of the glass bulb, and the suspension applied to the inner surface of the glass bulb is dried. In the manufacturing method, while maintaining the longitudinal direction of the glass bulb substantially vertical, a blower nozzle is brought into close contact with the upper end of the glass bulb to blow air into the glass bulb, and then the blower nozzle is The method has a step of blowing the air into the glass bulb in place of another air blowing nozzle that blows an air amount different from the air amount of the one air blowing nozzle.

A method of manufacturing a fluorescent lamp according to claim 2,
The method according to claim 1, wherein the step is performed at least twice, and the air volume of the other air blowing nozzle in the final step is the largest, and the air volume of one air blowing nozzle in the first step is 2 times.
It is the second most.

[0010]

According to the method of manufacturing a fluorescent lamp of claim 1, the suspension is applied to the inner surface of the glass bulb, and thereafter, the longitudinal direction of the glass bulb is held substantially vertical while the upper end of the glass bulb is held. A step of blowing air into the glass bulb by closely adhering one air blow nozzle to the inside of the glass bulb, and then replacing the one air blow nozzle with another air blow nozzle that blows an air volume different from the air volume of the one air blow nozzle to blow the air into the glass bulb. Is going. Therefore, the air velocity of the air blown from each air blow nozzle into the glass bulb becomes constant in the longitudinal direction of the glass bulb, and in this process, changing the air blow valve changes the air volume inside the glass bulb. The dried film thickness of the suspension applied to the glass bulb can be formed uniformly in the longitudinal direction of the glass bulb.

A method of manufacturing a fluorescent lamp according to claim 2,
The method according to claim 1, wherein the step is performed at least twice, and the air volume of the other air blowing nozzle in the final step is the largest, and the air volume of one air blowing nozzle in the first step is 2 times.
Since it is the second largest, the thickness of the suspension after drying can be formed uniformly in the longitudinal direction of the glass bulb without roughening the surface of the suspension applied to the glass bulb.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for manufacturing a fluorescent lamp of the present invention will be described with reference to FIG.

In FIG. 1, reference numeral 11 denotes a drying device, and air is blown to the drying device 11 by a blower pipe 12 as indicated by an arrow. A center valve 13 is fixed to one end of the blower pipe 12, and a valve receiver 14 is rotatably attached to the lower side of the center valve 13 so that the center valve 13
Air flows from the blower pipe 12 into the air space surrounded by the valve receiver 14 and the valve receiver 14. In addition, the valve receiver 14
For example, 27 blower head portions 21 are provided on the side surface portion 15, and a joint portion 22 as a blower nozzle for ejecting air is formed at the tip of each blower head portion 21. Then, each joint 22 communicates with the air space through an air volume adjusting cock 23 and a flow meter 24 in this order from the joint 22 side.

On the other hand, the upper end portion 26 and one end side of the glass bulb 25
A tubular joint 28 to which 27 is closely attached is provided.
The other end 29 is formed so as to be attachable to and detachable from the joint portion 22. When the bonded body 28 comes into close contact with the bonding portion 22, the inside of the glass bulb 25 is communicated with the bonding portion 22 and air is blown into the inside of the glass bulb 25.

The bonded body 28 attached to the glass bulb 25 has a first blower head portion 21, a second blower head portion 21, a third blower head portion 21, ... The head portions 21 are brought into close contact with each other, for example, for 40 seconds, and air is blown into the inside of the glass bulb 25 from the joint portions 22 of the blower head portions 21. Furthermore, the air volume of each blow head unit 21 is set as shown in Table 1, for example.

[0016]

[Table 1]

According to Table 1, when the blower head portion 21 to be brought into close contact with the joined body 28 attached to the glass bulb 25 is changed from the seventh blower head portion 21 to the eighth blower head portion 21, When the eighteenth blow head part 21 is changed to the nineteenth blow head part 21, the wind velocity of the blown air inside the glass bulb 25 changes.

Next, the operation of this embodiment will be described.

The glass bulb 25 is formed, for example, in a straight tube shape, and a suspension of phosphor particles, for example, is poured into the inner surface of the glass bulb 25 to apply the suspension.

Then, the glass bulb 25 is introduced into the drying device 11, the longitudinal direction of the glass bulb 25 is held substantially vertically, and the joined body 28 is attached to the upper end portion 26 of the glass bulb 25.
One end side 27 of is attached. Then, the other end side 29 of the joined body 28 comes into close contact with the joined portion 22 of the first blower head portion 21,
When the air volume adjusting cock 23 is opened, the inside of the glass bulb 25 communicates with the air space through the joint 22. Further, air is adjusted to a predetermined air volume by the air volume adjusting cock 23 and the flow meter 24, and a predetermined air volume of air is blown into the glass bulb 25 through the joint portion 22. Then, when 40 seconds have passed, the joining between the joined body 28 attached to the upper end portion 26 of the glass bulb 25 and the joined portion 22 of the first blower head portion 21 is released, and the glass bulb 25 is From the joint portion 22 of the first blower head portion 21 to the second blower head portion 21 arranged next to the first blower head portion 21.

In this way, the joined body of the glass bulb 25
28 is the first blowing head 21 to the 27th blowing head 21
When the bonded portion 22 of the twenty-seventh blower head portion 21 and the bonded body 28 of the glass bulb 25 are released from each other, the suspension applied to the inner surface of the glass bulb 25 dries. ..

As described above, according to the above method, since the bonded body 28 from which air is blown is in close contact with the upper end portion 26 of the glass bulb 25, the wind velocity of the air inside the glass bulb 25 is equal to that of the glass bulb 25. It becomes constant in the longitudinal direction.

Further, the glass bulb 25 is a drying device.
Blower head part 21 with different air volume depending on the index of 11
In order, and the joint 22 for each blower head 21.
The suspension applied to the inner surface of the suspension dries while maintaining a uniform film thickness in the longitudinal direction. The film thickness of the fluorescent film applied and dried on the glass bulb 25 becomes uniform in the longitudinal direction of the glass bulb 25.

The air volume inside the glass bulb 25 is the largest from the nineteenth blow head section 21 to the twenty-seventh blow head section 21 at the end of drying, and the first blow time at the start of drying next. The amount of air from the blower head 21 to the seventh blower head 21 is second largest, and the amount of air from the eighth blower head 21 to the eighteenth blower head 21 is the smallest. Fine lines are prevented from occurring on the surface of the fluorescent film thus dried, and the surface of the dried fluorescent film is prevented from being roughened.

Further, the amount of air blown into the glass bulb 25 for each of the blowing heads 21 is adjusted according to the dried state of the suspension, as compared with the above embodiment, and the air flow adjusting cock 23 and the flow meter 24.
Since it can be set finely with, glass bulb 25
It is possible to reliably prevent the generation of fine streaks such as the phosphor particles being blown off on the inner surface of, and the surface roughness of the dried phosphor film.

Therefore, when a fluorescent lamp is manufactured by using the glass bulb 25 having the fluorescent film formed thereon, since the film thickness of the fluorescent film formed on both ends of the fluorescent lamp is the same, both ends of the fluorescent lamp at the time of lighting. It is possible to prevent the difference in chromaticity that occurs in 1) and to eliminate the visual color unevenness of the fluorescent lamp at the time of lighting.

In the above embodiment, the blower head section
Although 27 are provided, the number of the blower heads 21 may be set appropriately, and in this case, the same effect as that of the above-described embodiment can be obtained.

Although the amount of air blown by the blowing head 21 is changed in two steps, the same effect as that of the above embodiment can be obtained even if the amount of air is changed in several steps.

[0029]

According to the method of manufacturing a fluorescent lamp according to the first aspect of the present invention, the blowing nozzle is in close contact with the upper end of the glass bulb to blow air inside the glass bulb, and the blowing nozzle for blowing the glass bulb is changed. Since the step of changing the amount of air blown into the glass bulb is performed, the film thickness of the suspension applied and dried on the glass bulb can be made uniform in the longitudinal direction of the glass bulb.
Therefore, if a fluorescent lamp is manufactured by forming a fluorescent film by applying, for example, a suspension of phosphor particles to a glass bulb as a suspension and drying it, it is possible to form the same thickness of the fluorescent film on both ends of the fluorescent lamp. It is possible to prevent the chromaticity difference between both ends of the fluorescent lamp when the lamp is turned on.

According to the manufacturing method of the fluorescent lamp of the second aspect, in the first aspect, the step is performed at least twice, and the air volume of the other blowing nozzles in the final step is the largest, and then the first. The air volume of one blowing nozzle in the process is 2
Since it is the second largest, it is possible to prevent the generation of fine streaks of the suspension applied to the inner surface of the glass bulb and the occurrence of rough skin on the surface of the dried suspension.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a method of manufacturing a fluorescent lamp of the present invention, and illustrating a step of drying a suspension applied on the inner surface of a glass bulb.

FIG. 2 is an explanatory view showing a conventional method of manufacturing a fluorescent lamp and explaining a step of drying a suspension applied on the inner surface of a glass bulb.

FIG. 3 is an explanatory view explaining another step of drying the suspension applied to the inner surface of the glass bulb.

[Explanation of symbols]

 22 Joint as air blow nozzle 25 Glass bulb 26 Upper end

Claims (2)

[Claims] 1. A suspension is applied to the inner surface of a glass bulb,
In a method for manufacturing a fluorescent lamp in which the suspension applied to the inner surface of this glass bulb is dried, while holding the longitudinal direction of the glass bulb substantially vertical,
A blower nozzle is brought into close contact with the upper end of the glass bulb to blow air inside the glass bulb, and then the blower nozzle is replaced with another blower nozzle that blows an air volume different from that of the blower nozzle. A method of manufacturing a fluorescent lamp, comprising the step of blowing air into the glass bulb. 2. The process is performed at least twice, and the air volume of the other air blowing nozzle in the final step is the largest, and the air volume of the one air blowing nozzle in the first step is the second most. The method of manufacturing a fluorescent lamp according to claim 1.