JPS6081732A - Method of manufacturing fluorescent lamp - Google Patents

Abstract

PURPOSE:To increase the aging effect to improve the yield, so as to reduce the cost of a fluorescent lamp by carrying out aging process immediately after the exhaust process and thereafter carrying out the basing process. CONSTITUTION:The bulbs 1 are drawn out one at a time from the rotary drum 9 for the exhaust process by means of a conveyor and are fed into the aging process. When one bulb 1 is fitted into each of the pair of feeding head 22, every two lead wires from both ends of the bulb are certainly brought in contact with the corresponding two of the three-in-a-set power feeding plate 23 to receive the power. And a three-in-a-set power feeding rail 25 is divided into a plurality of section in a longitudinal direction and the value of voltage fed in every one of sections is changed stepwise, whereby the bulbs 1 immediately after completion of the exhaust process are lighted by stepwise applying voltage in a fixed time from the fitting of the feeding head to the release and the aging is carried out. Only the bulbs 1 which are judged to be articles of good quality are fed into the next basing process by means of the conveyor.

Description

[Detailed description of the invention] B. Industrial application field This invention is utilized in the manufacture of straight tube fluorescent lamps.

The manufacturing process of conventional straight tube fluorescent lamps includes a sealing process, an exhaust process,
There are four steps: a basing step and an aging step, and these steps are conventionally performed in the above sequence. This will be explained in detail with reference to FIGS. 1 to 3.

First, a straight tube type bulb (H) as shown in FIG. After coating and drying, the phosphor (2) is deposited on the inner surface of the bulb (1) by heating and baking at about 600° C. in a heating furnace, as shown in FIG. 1(b). Next, as shown in Figure 1(C), after selectively removing the phosphor (2) on the inner surface of both ends of the bulb (1), the stems (3) are sealed on both ends of the bulb. .Each stem (3), (3) has two strut lines (
4), (4) have been planted, and the support lines (4), (4)
, - extend outward as lead wires (5), (5), -, and electrodes (6), (6) made of filament coils are supported at the tips of the inner protrusions. (6)′,, (6) is an electron emission resistant material (7), (7)
is painted. In addition, each stem (3), (3) has a valve (
1) has exhaust pipes (8) communicating with the inside.

The evacuation process that follows the sealing process is mainly carried out using the horizontal method, which is excellent in mass production and is carried out by holding the valve (1) horizontally. To the exhaust air installed at equal intervals on the circumference of the rotating drum (9), (9) - one for each set of facing throats (10), (10), -
This is done by fitting both ends of the light bulb (1). The rotating drums (9), (9) rotate intermittently (continuous rotation is also possible), and each set of exhaust heads (10), (10), --- is intermittently fed by a conveyor (11) from the sealing process. (Continuous feeding is also possible) The bulbs (1) that are supplied are sequentially supplied one by one, and the supplied bulbs (1) are connected to the rotating drum (9),
(9) and is taken out by another conveyor (12), for example, ^r gas (13) is supplied from one exhaust pipe (8) as shown in Fig. 2, and the other gas is pipe (8)
is evacuated by an external vacuum pump (14). During this evacuation, the bulb (1) is heated to about 500° C. to facilitate the ejection of impure gas contained in the phosphor (2) within the bulb (1). At the same time, the electrodes (6), (6) are energized to heat the electron radioactive substances (7), (7) to about 900℃~1.
It is heated to 000 degrees Celsius to turn it into an oxide and give it electron-emitting properties. After this thermal decomposition is completed, high-purity A
While supplying r gas (13), first open the gas supply side exhaust pipe (8).
) is tipped off from the root, and then, when the pressure inside the valve becomes constant, the other exhaust pipe (8) is tipped off from the root.

The valve (1) after the exhaust process is moved to a rotating drum (9),
(9) to the conveyor (12) and sent to the next basting process. As shown in Figure 3, the basting process involves connecting lead wires (5), (
5) After aligning the - in the axial direction, attach the gear-shaped bases (15), (15) to both ends of the valve (1), and attach the base pins (16), (16), -c IJ -yvA<
5 >, (5), - is the step of inserting and fixing in a protruding state. That is, base (15), (15)
Thermosetting cement (17), (17) is pre-coated on the inner peripheral surface, and the base (15), (15) is fitted to both ends of the valve via this cement (17), (17). This is done in the process of heating the cement (17), (17) with a burner flame or the like. After fixing the base, base pin (16), (
16) Lead wires (5), (5), - are welded to the tips of - and the lead wires that are no longer needed are cut and removed.

Finally, aging is performed using, for example, a conventional fluorescent lamp lighting circuit as shown in FIG. In addition, (1B) in Fig. 4 is an AC power supply, (19) is a power switch, and (20
) is the ballast, and (21) is the starter. Aging is performed by changing the voltage stepwise between both electrodes (6) and (6).
By applying the voltage and lighting it for a certain period of time, an emission center of the electron radioactive substances (7), (7) is formed, and the impurity gas contained in the electron radioactive substances (7), (7), etc. is separated out, and the fluorescent material ( 2) is carried out for the purpose of cleaning the inner space of the valve by adsorption to the aging process, and those that achieve good results in this aging process are shipped as products.

Problems to be Solved by the Invention In the above manufacturing process, the causes of defective fluorescent lamps include cranking at the sealing part of the stems (3) and (3) in the sealing process and exhaust gas in the exhaust process. Pipe (8), (8
) There is an increase in the internal pressure of the valve due to a slow leak caused by a lamp-off failure. There is no problem with this slow leak if it is detected immediately after the exhaust process, but since the slow leak progresses gradually over a long period of several tens of minutes, it enters the next basting process without being detected immediately after the exhaust process, and then It is not until the aging process that defective fluorescent lamps due to slow leakage are detected and eliminated. Therefore, if the valve is defective due to slow leakage or other causes, the base (15) at both ends
The wasted use of base (15) is one of the causes of increased material costs for fluorescent lamps.

In addition, the aging process is performed as the final process, but at this time the fluorescent lamp is in a cold state, so even when electricity is turned on, the temperature rise of the electrodes (6) (6) is delayed, causing electron radioactive substances!
(7) Impure gas from (7) is not sufficiently expelled, or the phosphor (2) does not adsorb impure gas sufficiently, resulting in the aging circuit diagram not being fully utilized. As a result, the yield was poor.

29. Means for Solving Problems The present invention has been made to solve the above problems, and as a means of solving this problem, the sealing process and exhaust process in fluorescent lamp manufacturing are performed in the same way as in the conventional method, but the aging process is added immediately after the exhaust process. The method is characterized in that a basing process is performed after that. In this way, aging is performed on the valves in a high temperature state after the exhaust process, which increases the aging effect, and also eliminates those that are determined to be defective in the aging process and sends only good products to the basting process. This reduces waste of space.

E. Example The present invention will be explained from the polysyntal type exhaust process shown in FIGS. 5 and 6. As shown in FIG. Each piece is taken out by a conveyor (12) and sent to the I-jig process. This aging process is performed, for example, as shown in No. 8, where power is supplied to both UX+ parts of one valve (1)
). Each power supply head (22) (22
) has three insulated power supply plates (23) (23)- arranged in a circular shape on the inner circumference, and each power supply plate (23) (23)-. is connected via brushes (24) (24)-. Electrical contact with external power supply rail (25) (25). Such a power supply head (22) (22) is used, for example, on the conveyor (
A plurality of sets of two open sets are installed at equal intervals on the power supply head (22) (22), and a power supply rail (25) (25L-) is installed along the transport direction of the power supply head (22) (22). When one bulb (1) is fitted to the head (22) (22), a set of three power supply plates (23) corresponding to two lead wires (5) (5L-) from both ends of the bulb are connected. (23)・
- Be sure to touch the two terminals to receive power. In addition, the three sets of power supply rails (25) (25) are divided into multiple sections in the length direction, and the voltage value to be supplied to each section is changed in stages. (1)
is turned on by stepwise voltage application within a certain period of time until the power feeding head (22) (22) is unfitted and removed, and aging is performed.

Immediately after the exhaust process, the valve (1) is in a high temperature state, and from this state, the electrodes (6) (6) are energized and aging begins, so impurity gas from the electron radioactive materials (7) (7) is effectively expelled. , the impurity gas adsorption of the phosphor (2) improves, increasing the aging effect, and this increased effect shortens the aging time and improves the yield rate.'
. Also, if there is a slow leak in the bulb (1), this slow leak will be detected during the long-term lighting test during aging.
Defective valves due to this slow leak are eliminated before being sent to the next process. In addition, defective bulbs due to other causes are also detected and eliminated by lighting during the aging process.

Only the valves (1) that have been aged and determined to be good are sent to the next basting process in a container (26). This basting process is performed in the same manner as in the past, including the steps of aligning the lead wires, fitting the base, and fixing the base by heating. Since this is done only for good valves, there is no waste of the base (15) (15).

Effects of the Invention As described above, according to the present invention, wastage of base materials is greatly reduced, and since the aging of the valve is performed on high-temperature valves, the aging effect is increased and the yield is improved.
The cost of fluorescent lamps can be reduced.

[Brief explanation of drawings]

Figures 1 to 3 are partial sectional views of the bulb at each step to explain the conventional fluorescent lamp manufacturing method, Figure 4 is an aging circuit diagram, and Figures 5 and 6 are examples of equipment in the exhaust process. FIG. 7 is a schematic side view showing a specific example of an apparatus for carrying out the method of the present invention, FIG. 8 is an enlarged sectional view taken along line 8-Δ of FIG. 7, and FIG. 8 is a sectional view taken along line B-B in FIG. 8. (1) - Bulb, (2) - Fluorescent material, (3) - Stem, (6) - Electrode, (7L - Electron radioactive material. Patent applicant 13 Hon Denki) Agent for H-No Luctronics Co., Ltd. Hideo Ehara

Claims (1)

[Claims] (11 Step of sealing the stem having electrodes coated with electron radioactive material at both ends of the opening of the bulb whose inner surface is coated with fluorescent material. After exhausting the impurity gas inside the bulb, inert gas , an evacuation process in which mercury is filled in, an aging process in which a predetermined voltage is applied between the electrodes at both ends of the bulb to turn it on, and a base is fitted to both ends of the ζ bulb for those that are found to be of good quality after aging. 1. A method for manufacturing a fluorescent lamp, comprising a basing step.