JPS63187533A - Manufacturing device for bent tube type fluorescent lamp - Google Patents

Abstract

PURPOSE:To simplify a device exhausting a glass tube end reduce the cost by providing a rotary valve having a pair of independent exhausting through holes connected to two exhaust holes of an exhaust head at two positions nearby at different distances from the rotation center. CONSTITUTION:When a pair of an outside through hole (c) and an inside through hole (d) are moved to the exhaust position by the intermittent rotation of a turn table 10 and a rotary valve 13, a pair of the through holes (c), (d) coincide with a pair of an outside vacuum hole (e) and an inside vacuum hole (f) of a stationary valve 14, the through holes (c), (d) are vacuumed, thereby the first and second exhaust holes 12a, 12b of the first and second heads 11a, 11b of an exhaust head 11 located at the exhaust position are vacuumed via pipes 22, 22', and two exhaust pipes 6, 7 in a glass tube 1 are exhausted. Accordingly, a manufacturing device simple and inexpensive facility-wise can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing a curved fluorescent lamp used in a compact fluorescent lamp device, and in particular, to an apparatus for manufacturing a curved fluorescent lamp used in a compact fluorescent lamp device. l! Regarding 25.

Conventional bulb-shaped fluorescent lamp devices that house a curved-tube fluorescent lamp and its lighting means in an envelope equipped with a connection means (E-type cap, etc.) to a summer blood-sucking AC power source, and other types of fluorescent lamps that contain mercury. Mercury vapor pressure (approximately 6 x 10-3 To
rr), the light output is maximized. However, when the fluorescent lamp is turned on inside the envelope of a compact fluorescent lamp device, the temperature inside the envelope rises, causing the temperature of the coldest part of the fluorescent lamp to exceed 40°C, causing the mercury vapor pressure to fall below the optimum value. becomes high, and the light output decreases significantly.

Therefore, recently, curved tube fluorescent lamps filled with amalgam are used to control the mercury vapor pressure to around 6.times.1O@-3 Torr when the lamp is stably lit. This amalgam is composed of mercury, indium, bismuth, etc., and exhibits an extremely low vapor pressure compared to mercury alone, and is stored in the exhaust pipe, which is the coldest part when the lamp is lit.

An example of a curved tube fluorescent lamp having such an amalgam is shown in FIGS. 10 to 12. (1) is a double U-shaped glass tube, (2) (2) is a double U-shaped glass tube, and (2) is a glass tube at both ends of the glass tube (1). The stems (3) (3) and - are enclosed in each stem (2) (
2) two lead wires each sealed through, (4)<4)
are filament coils connected to the inner ends of each pair of lead wires (3) (3)-, (5) (5) are emitter substances applied to each filament coil (4) (4), (6) and (7) are two first exhaust pipes and a second exhaust pipe connected to the stems (2) and (2). 1st exhaust pipe (
6) Inside is a glass rod (8) and a fixed amount of spherical amalgam (9)
is inserted, and both exhaust pipes (6) and (7) are sealed off to a predetermined length (tip-off). The glass rod (8) is inserted into the first exhaust pipe (6) to prevent the amalgam (9) from moving from the first exhaust pipe (6) into the glass tube (1).
) will be inserted before. In other words, if the amalgam (9) enters the glass tube (1), it will cause problems such as not being able to obtain the desired light output characteristics.
8) prevents this. The glass rod (8) and the spherical amalgam (9) are made of almost the same material, so the gap between the glass rod (8) and the first exhaust pipe (6) is covered with amalgam (9) when the lamp is turned on.
) The mercury vapor evaporated from the glass tube (1) flows to control the mercury vapor pressure in the glass tube (1) to near the Q normal value.

For example, such a curved tube fluorescent lamp is manufactured as follows. Two exhaust pipes (6) of glass tubes (1)
(7) is connected to an exhaust head (not shown) that is fed intermittently on a fixed orbit, and the glass tube (1) is fed intermittently together with the exhaust head to first be sent into a heating furnace, where it is heated while the glass tube (1) is fed intermittently. Vacuuming (exhausting) inside the tube (1) and connecting the lead wire (3) (3)
) The emitter substance (4) (4) is thermally decomposed by energizing the filament coil (4) (4) through the
A series of evacuation treatments are performed to supply an inert gas, such as cleaning argon, into the glass tube (1). Next, remove the glass tube (1) that came out of the heating furnace from the exhaust head, and manually insert the glass rod (8) and amalgam (9) into one first exhaust pipe (6). Attach 1) to the exhaust head again. Next, the inside of the glass tube (1) is evacuated with the exhaust head,
After supplying high purity argon, two exhaust pipes (6)
Chip off (7).

■Remove +1 point By the way, after exhausting the glass tube (1) as described above, remove the glass tube (1) from the exhaust throat and connect it to the first exhaust pipe (6). Manufacturing equipment that manually supplies the glass rod (8) and amalgam (9) to the exhaust head, reinstalls the glass tube (1) in the exhaust head, and sends it to the subsequent process is difficult to save labor and is poor in mass production.

Therefore, if you install a glass rod (8) and amalgam (9) in the first exhaust pipe (6) in advance, attach the glass pipe (1) to the exhaust head, and perform exhaust treatment. , it is thought that mass productivity will improve. However, if this is done, the amalgam (9) inserted into the first exhaust pipe (6) will melt due to the heat during the exhaust treatment, and the mercury will evaporate.

In view of these problems, the inventor of the present invention inserted only the glass rod (8) into the first exhaust pipe (6) in advance and removed the glass pipe (1).
We have devised a manufacturing device that attaches the amalgam (9) to the exhaust head, performs exhaust treatment, and then supplies the amalgam (9) to the first exhaust pipe (6) via the exhaust head, and are considering its practical use. According to this manufacturing apparatus, it is possible to manufacture the glass tube (1) from exhaust treatment to exhaust pipe tip-off with the glass tube (1) attached to the exhaust head, and also to manufacture the first exhaust pipe (6) after exhaust treatment.
) is easy to automate.

It has been confirmed that amalgam (9) has advantages such as not being exposed to heat effects during exhaust treatment. However, if the glass rod (8) is inserted in advance into the first exhaust pipe (6), the glass tube (1) is attached to the exhaust head, and exhaust processing is performed, the first and second exhaust pipes (6) ( When vacuuming the inside of the glass tube in 7), the glass rod (8) is sucked from the first exhaust pipe (6) into the exhaust hole of the exhaust head, and becomes clogged in the exhaust hole of the exhaust head, causing the exhaust head to become clogged. The exhaust capacity may be significantly reduced, or the glass rod (8) sucked into the exhaust after exhaust treatment may not return to the first exhaust pipe (6).

Therefore, the inventors of the present invention have considered and studied the following in order to solve the above problem. For example, the glass tube (1) is evacuated only by the second exhaust pipe (7) without the glass rod (2). but,
This requires evacuation, and good evacuation cannot be performed.

Further, a stopper is provided in the exhaust hole connected to the first exhaust pipe (6) to which the sucked glass rod (8) hits. In this case, the stopper is located in the passage of the amalgam (9) that is supplied from the exhaust head to the first exhaust pipe (6) after exhaust treatment, and the amalgam (9) becomes clogged at the location where the stopper is located, causing the first exhaust pipe to become clogged. (6) There is a concern that supplies will not be provided.

In addition, the two first and second exhaust pipes (6) of the glass tube (1)
(7) is connected to two independent exhaust systems, and a solenoid valve for controlling the amount of exhaust per unit time and the exhaust time is arranged in each of the two exhaust systems.

Then, the inside of the glass tube (1) is connected to the first and second exhaust pipes (6) (
7), the first exhaust pipe (
6) is made smaller than the exhaust amount from the second exhaust pipe (7), and the glass rod (8) in the first exhaust pipe (6) is connected to the exhaust system of the first exhaust pipe (6). Vent the air to avoid inhalation. In this way, the glass rod (
8) can be evacuated in a short time while storing it, but 1
It is necessary to provide a solenoid valve in the exhaust system of each of the many exhaust heads installed in one manufacturing device, which makes the entire device complicated and increases the cost.

Therefore, the present invention simplifies and lowers the cost of a device for exhausting the inside of a glass tube through two exhaust pipes extending from both ends of a curved glass tube, and also provides a device for evacuating the inside of a glass tube through two exhaust pipes that are inserted into one of the two glass tubes. It is an object of the present invention to provide a manufacturing device having a function of evacuating a glass rod so that the glass rod is not sucked into an exhaust system when evacuating.

To get angry;.

In order to achieve the above-mentioned object, the present invention connects two exhaust pipes extending from both ends of a curved glass tube to two independent exhaust holes of an exhaust head that is intermittently fed along a fixed track, so that the two exhaust pipes are fixed at a fixed position. A device for exhausting the inside of a glass tube through two exhaust pipes, the device rotates intermittently together with the exhaust head, and has two independent exhaust holes connected to the two exhaust holes of the exhaust head at two locations adjacent to each other at different distances from the center of rotation. a rotary valve having a pair of exhaust through holes, and a rotary valve slidably joined to the rotary valve,
When the pair of through holes of the rotary valve come to the fixed position, a fixed valve having a pair of vacuum holes that align with the pair of through holes and draw a vacuum, and a fixed valve that is directly connected to each vacuum hole of the fixed valve. It is characterized by being equipped with a vacuum system.

■ The timing when the pair of through holes in the rotary valve and the corresponding pair of vacuum holes in the fixed valve meet during the intermittent rotation of the rotary valve is when the pair of through holes in the rotary valve meet through the inner side near the center of rotation. The hole is earlier than the outer through-hole, and therefore the inner through-hole is evacuated earlier than the outer through-hole. Connect one exhaust pipe with the rod inserted,
If another exhaust pipe is connected to the inner through-hole, the glass tube will be exhausted almost simultaneously by the two exhaust pipes, and the glass rod will not be sucked into the exhaust system from the exhaust pipe. Such an action can be achieved more reliably and various actions can be selected by selecting the hole diameters of the through hole of the rotary valve and the vacuum hole of the fixed valve.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

FIG. 1 is a schematic plan view of the entire manufacturing apparatus for the curved fluorescent lamp shown in FIG. 10, in which (10) is a horizontal turntable, (1
1) (11) --- are a plurality of exhaust heads arranged vertically at equal intervals around the turntable (10),
One exhaust head (11) includes a pair of independent cylindrical first heads (11a), as shown in FIGS. 2 and 3, for example.
) and a second head (Ilb), with a pair of first,
The second head (11a) (11b) has independent exhaust holes (12a) (12b) in the axial direction. The turntable (10) rotates intermittently at the arrangement pitch of the exhaust heads (11). (13) is a rotary valve that rotates intermittently about the same rotation center as the turntable (10), and (14) is a fixed valve that is slidably joined to the lower surface of the rotary valve (13). (15) to (20) are a glass tube supply section, an amalgam supply section, a heating section, an amalgam moving section arranged at each fixed position along the outer periphery of the turntable;
These are the exhaust pipe tip-off section and the glass tube take-out section.

When one exhaust head (11) is in the fixed position of the glass tube supply section (15), the first exhaust pipe (6) of the glass tube (1) is now in the first head (lla) as shown in FIG. )
is connected to the lower part of the first exhaust hole (12a), and at the same time the second
The exhaust pipe (7) is built through the second exhaust hole (11b) of the second head (11b).
12b), and the glass tube (1) is connected to the chuck (21) which is intermittent with the turntable (lO).
is maintained. This glass tube (1) is the first exhaust pipe (6)
A glass rod (8) is inserted in advance. First,
Each exhaust hole (
12a) (12b) are equipped with exhaust pipes (22) (2
2°) and inert gas (argon) supply pipe (23)
(23°) is connected, and the exhaust pipe (22)
(22') is connected to the rotary valve (13) as described below, and is also connected to the first exhaust hole (12a) of the first head (lla).
) is appropriately closed with an opening/closing type M (24), and the second exhaust hole (12b) of the second head (11b) is a closed hole at the top.

When the exhaust head (11) with the glass tube (1) attached comes to the fixed position of the amalgam supply section (16), the lid (24) of the first head (11a) is opened and the first exhaust hole ( A fixed amount of amalgam (9) is supplied to the top of 12a'I, M (24) is closed, and the amalgam (9)
is retained at the upper part of the first exhaust hole (L2a) by appropriate means. While the exhaust head (11) passes through multiple positions of the next heating section (17), heating of the glass tube (1), exhaust using two exhaust pipes (6) and (7), electrode pyrolysis, and cleaning are performed. A series of exhaust processes including supply of argon are performed. The exhaust head (11) exits the heating section (17) and enters the amalgam moving section (1).
8), the amalgam (9) that was reserved at the top of the first exhaust hole (12a) is sent to the first exhaust hole (12a).
) and moves into the first exhaust pipe (6). after that,
Before the exhaust head (11) moves to the exhaust pipe tip-off part (19), the glass tube (1) is evacuated and filled with argon, and the first The two exhaust pipes (6) and (7) are tipped off, and the glass tube (1) is taken out from the glass tube take-out part (2o).

The amalgam supply position is provided after the heating section (17), and at this position, the first head (lla
) may also be used to supply a fixed amount of amalgam (9) directly.

The present invention is characterized by a pair of rotary valves (13) and fixed valves (14) incorporated into the exhaust system of the exhaust head (11).
Specific examples thereof will be explained with reference to FIGS. 4 to 7.

The rotary valve (13) has a plurality of through holes (C) (c) - and r
Multiple 1s with a constant pinch along a circle with radius r2 smaller than l
It has through holes (d) (d)-. Former outer through hole (c)
(c)-- and the latter inner through-holes (d) (d)- are circular holes with the same number and diameter, and a pair of adjacent outer through-holes (C) correspond to one exhaust head ( 11) is connected to the first exhaust hole (12a) of the first head (11a) by a pipe (22), and the second through hole (d) remains.
It is connected to the second exhaust hole (12b) of the head (11b) by a pipe (22').

The fixed valve (14) is arranged concentrically with the rotary valve (13), and its upper surface matches each through hole (c) (c)-1 (d) (d)- exposed on the lower surface of the rotary valve (13). It has a plurality of circular vacuum holes (e) (e) -1 (f) (f) -, each vacuum hole (e) (e) - -1 (f) (fL- is an external common It is constantly evacuated by the vacuum system (25).The outer vacuum holes (e) lined up in a circle with radius r1 of the fixed valve (14)
(e) --1 and inner vacuum holes (f) lined up in a circle with radius r2
) (f) - is a pair of adjacent vacuum holes, and each pair of vacuum holes (e) (f3>-・, (f) ([) - is only at the exhaust position of the turntable (10) It is formed.

Therefore, the turntable (10) and the rotary valve (13)
A pair of outer through holes (C) and inner through holes (d) are intermittent rotated.
) moves to the exhaust position, this pair of through holes (
c) (d) shows the pair of outer vacuum holes (
e) and inner vacuum hole (matching 0, through hole (c) (d)
is evacuated, which causes the pipe (22) (22
) through the exhaust head (11) in the exhaust position.
The first and second exhaust holes (12a)<12b) of the first and second heads (11a) (11b) of the glass tube (1) are evacuated, and the two exhaust pipes (6) (7) ) is exhausted. This glass tube (1) is evacuated at the following timing.

In Figure 7, the solid line indicates the fixed valve (14), the chain line indicates the rotating valve (13), and the two-dot chain line indicates the position of the pair of through holes (c) and (d) before the rotating valve (13) rotates. show. When the rotary valve (13) intermittently rotates by one pinch on the fixed valve (14) in this state, the difference in distances r1 and r2 from the rotation center P of the outer through hole (c) and the inner through hole (d) causes the valve to During the rotation, the inner through hole (d) reaches the corresponding inner vacuum hole (f) first, as shown by the dashed line in FIG.
When both holes (d) and (f) become a little heavier, the outer through hole (d) reaches the corresponding outer vacuum hole (e), and when the rotary valve (13) completes one pitch rotation, the pair of through holes (c) (d) matches a pair of vacuum holes (e) <f>. Therefore, the timing at which the pair of through-holes (C) and (d) are evacuated is earlier for the inner through-hole (d), and the vacuum suction force for both of the pair of through-holes (C) and (d) is faster. hole (e)
Until it matches (f), the inner through hole (d) is a little stronger. As a result, the glass tube (1) is first exhausted from the second exhaust pipe (7), and the glass rod (8) in the first exhaust pipe (6) is pulled toward the glass tube (1) and slightly Exhaust is also performed from the first exhaust pipe (6) with a time delay of . Due to the difference in the timing of exhaust between the first and second exhaust pipes (6) and (7), the glass rod (8)
There is no need to worry about the gas being sucked into the first exhaust hole (12a), and the glass tube (1) is connected to the two exhaust pipes (6) and (7).
Since the air is evacuated at a high speed, high-speed evacuation is realized.

In the above embodiment, the pair of through holes (c) and (d) and the pair of vacuum holes (e) and (f) have the same hole diameter, and when each pair match, the glass tube (1) Second exhaust pipe (6) (7)
In this case, the glass rod (8) will be evacuated with the same vacuum suction force, and there is no guarantee that the glass rod (8) will not be vacuumed at this time.
Experimentally it has been found that the glass rod (8) is not vacuum-suctioned.

It is also known that the above guarantee can be obtained in the following way. That is, as shown in FIGS. 8 and 9, for example, the hole diameters dl of the outer vacuum holes (c) (c)- and the corresponding outer vacuum holes (e) (e)- are set by the inner through holes ( d) (d)
- and the inner vacuum hole (f) (f) - should be smaller than the hole diameter d2. If you do this, 01! I N 1jll hole (
d) is the inner vacuum hole (f), and the outer ffi'l through hole (C
) reaches the outer vacuum hole (e) earlier, and
When each pair of through holes (C) and (d) and vacuum holes (e) and (f) match, the vacuum suction force of each through hole (c) and (d) is stronger on the inside, so the glass tube (1) is the second exhaust pipe (7)
Since the glass rod (8) is evacuated more strongly than the first exhaust pipe (6), there is no need to worry about the glass rod (8) being evacuated to the first exhaust hole (12a).

As described above, according to the present invention, even if a glass rod is inserted into one of the exhaust pipes at both ends of a curved glass tube and the glass tube is exhausted by the exhaust pipes at both ends, The glass rod can be evacuated without fear of being vacuum-suctioned to the exhaust head side, making it possible to speed up the evacuating process and improving mass productivity in manufacturing curved tube fluorescent lamps. Furthermore, as a means for preventing vacuum suction from the glass rod, the rotary valve or fixed valve incorporated in the exhaust system may have a simple structure and be inexpensive, and therefore, a manufacturing apparatus with simple and inexpensive equipment can be realized.

[Brief explanation of the drawing]

Figures 1 to 7 are for explaining one embodiment of the present invention. Figure 1 is a plan view schematically showing the entire manufacturing equipment, and Figure 2 is an enlarged view of the exhaust head of the equipment shown in Figure 1. Front view,
Figure 3 is a cross-sectional view taken along the line A-A in Figure 2, and Figure 4 is a cross-sectional view along line A-A in Figure 2.
FIGS. 5 and 6 are enlarged plan views including partially omitted parts of the rotary valve and fixed valve in the device shown in FIG.
7 is an enlarged plan view for explaining the operation of a part of FIG. 4. FIG. 8 and 9 are for explaining other embodiments of the present invention, FIG. 8 is a partial plan view including partially omitted parts of a rotary valve and a fixed valve, and FIG. FIG. Figure 10 is a perspective view of a curved tube fluorescent lamp, and Figure 11 is a perspective view of a curved fluorescent lamp.
FIG. 12 is a partially enlarged cross-sectional view of FIG. 0, and FIG. 12 is a cross-sectional view taken along line DD of FIG. 11. (1) - Glass tube, <G) (7) - Exhaust pipe, (11
) - Exhaust head, (12a) (12b) - Exhaust hole, (
13) One-turn valve, (c) (cl)...-M passer, (14) - Fixed valve, (e) (f) - Vacuum hole,
(25) - Vacuum system. Patent Applicant: NEC Home Electronics Co., Ltd. 1-22 Director Mr. Nen Hara
−effect ′−)°14−χDO匝U Fig. 1 (Hei 1 Ero

Claims (2)

[Claims] (1) Two exhaust pipes extending from both ends of a curved glass tube are connected to two independent exhaust holes of an exhaust head that is intermittently fed in a fixed circular orbit, and the two exhaust pipes are connected in a fixed position to the inside of the glass tube. A device for exhausting air through an exhaust pipe, wherein a pair of independent exhaust holes are connected to two exhaust holes of the exhaust head at two locations that rotate intermittently together with the exhaust head and are located close to each other at different distances from the center of rotation. a rotary valve having a through hole; and a pair of rotary valves that are slidably joined to the rotary valve and that align with the pair of through holes to draw a vacuum when the pair of through holes of the rotary valve are in position. 1. An apparatus for manufacturing a curved tube fluorescent lamp, comprising: a fixed bulb having vacuum holes; and a vacuum system directly connected to each vacuum hole of the fixed bulb. (2) The apparatus for manufacturing a curved tube fluorescent lamp according to claim 1, wherein the diameters of the pair of through holes of the rotary bulb are different.