JPS5889756A - Sealing apparatus for electrode of luminous bulb for discharge lamp - Google Patents

Abstract

PURPOSE:To seal electrode with a high yield by radiating the working laser beam in revolution onto the outer peripheral surface of the electrode insertion cylinder part positioned at the upper side of a luminous bulb which is not sealed yet and supported by a luminous bulb supporting mechanism and feeding inert gas through an exhaust port. CONSTITUTION:Electrode insertion cylinder parts Va and Vb are installed around the vacant part U of a luminous bulb Z not sealed yet, and an exhaust cylinder part is installed on the wall of the vacant party. The electrode insertion cylinder part on the lower side is supported by a chuck mechanism 2, and a laser beam radiating apparatus 4 in rotary radiation type is installed whereby it radiates the working laser beam selectively onto the outer peripheral surface of the upper side cylinder part Va and softens it. Further, an electrode suspension member 31 which suspends and holds an electrode member B in the cylinder part Va is installed. An inert gas cylinder 37 for feeding inert gas through the exhaust cylinder part of the vacant space U is installed, and a pinching mechanism 38 for selectively pinching the softened cylinder part Va is installed. Therefore, only the necessary part on the cylinder part Va can be sealed with high accuracy, and oxidation of the electrode B during sealing work can be prevented.

Description

[Detailed description of the invention] 1) Technical field of invention The present invention relates to an electrode sealing device for an arc tube for a discharge lamp.

2) Prior art As shown in FIG. 1, an arc tube for a discharge lamp, such as a metal pallite lamp, usually has an electrode Qa in a quartz container P formed into a spherical shape, for example.

Qb are arranged coaxially and facing each other, and a predetermined gas and a luminescent substance R are sealed in a quartz container P.

The -pole QasQb is connected to external lead lines Ta and Tb via foil materials 8m and 8b, such as molybdenum, embedded in the so-called wall of the quartz container P.

By the way, in making T-koji for such an arc tube for a discharge lamp, the following method is generally employed. That is, for example, using a quartz tube, as shown in FIG. 2(a), the cavity U forming the discharge space and the cavity U
A pair of electrode insertion cylinder parts Va and Wb are connected symmetrically and coaxially around the cavity U, and an exhaust cylinder part X extends to an exhaust port W1 provided at the heel of the cavity U. An arc tube material 2 consisting of the following is manufactured. Next, - pole insertion cylinder part Va
, as shown in FIG. 2(b) within Vb.
e Q b @ Thin plate 8m, 8b and external protrusion Ta
, Tb are connected in series as electrodes Qa, Q
In this state, the electrode insertion cylindrical parts Va and Vb are heated with a water heater burner to sufficiently soften the cylindrical parts Va and Vbi. Then, in the softened state, pinch the above-mentioned "-pole extendable tubes Va and Vb with a pinch ll4m, and then cool and seal them.Next, use an exhaust gas of 1m5x to '!j! inside the trunk U. After sufficiently evacuation, the root part of the thoracic region X is melted and cut while containing the specified gas and the luminescent substance R, and the luminous tube shown in Fig. 1 is made. I'm trying to get it.

3) Problems with the prior art: 44! jInsert the A member,
In heating and softening and sealing the electrode insertion cylindrical portions Va and Vb, oxyhydrogen perf- is used as the heat source as described above. Although oxyhydrogen burners are the cheapest heat source, it is extremely difficult to heat only a defined area, and in many cases, it tends to heat a wider area than that area. In this way, since it is heated over a wider range than the defined area, the can pole insertion slope Vm
, Vb, the cavity U is also likely to be heated. Therefore, the cavity sU is heated. The characteristics of discharge lamps, particularly metal pallite lamps, etc., are influenced by the shape of the arc tube. Therefore, there was a layer in between that could not be manufactured at a high yield. In particular, in the case of arc tubes for car panels, where the diameter of the hollow part U is several inches, the electrode insertion cylinder part is also small in diameter and short, resulting in extremely poor yields. . Furthermore, when heating with an oxyhydrogen burner, turbulence occurs in the heating section depending on the orientation of the burner, and as a result, air is often drawn into the tube and oxidizes the electrodes.To prevent this, There were times when it required one-time skill.

4) Purpose of the present invention The present invention was made in view of the above circumstances.
Regardless of the size of the arc tube, it is possible to seal the electrodes with a simple operation without thermally deforming the cavity that forms the radiant void or oxidizing the electrodes. An object of the present invention is to provide an electrode sealing device for an arc tube for a discharge lamp, which can greatly improve the yield.

5) Structure of the Present Invention According to the present invention, the light emitting device selectively supports an unsealed luminous tube through the tube portion located on the lower side in the vertical direction. A rotary irradiation type laser light irradiation device is provided in which a tube f#JIIIl is provided and the outer circumferential surface of the electrode insertion tube located above the arc tube is selectively irradiated with processing laser light to soften it. . Further, an electric bridge suspension member that structurally suspends and holds the electrode member is provided in the monopole insertion tube located above the arc tube supported by the arc tube support mechanism, and this suspension member is used for the laser beam. It is supported by a stationary part via a thin support member provided across the light irradiation path in the power direction. Further, an inert gas supply device that supplies an inert gas into the arc tube through an exhaust port, and a pinch mechanism that selectively pinches the softened '-commuting electrode insertion cylinder 1kJi1 are provided, and at least the pinch mechanism A control device is provided for controlling the operations of the laser beam and the laser beam waxing device in a predetermined order.

6) Effects of the present invention In the Wt of the present invention, a laser beam is used as a heating source as in the front row. Generally, it is easy to increase or decrease the spot diameter of laser light.

Therefore, only the truly necessary portion of the electrode insertion tube can be heated to a desired temperature, thereby reliably preventing thermal deformation of the cavity forming the can space. In addition, a rotating irradiation type laser beam focusing device is used to heat the circumferential surface of the electrode insertion tube, so that the specified area of the tube has a uniform temperature in the horse direction. is heated to. Therefore, it is possible to automatically seal only the truly necessary portion of the tube portion to the Isogokujin without giving any other negative effects and with high precision. Furthermore, since the inert gas is supplied through the exhaust port, there is no possibility that the atmosphere will flow into the cavity through the cylindrical portion into the polar contact during heating. Therefore, there is no possibility that the electrode will be oxidized during the sealing process. These processing steps are carried out according to commands from the control device, so as long as the chain length conditions are set in advance in the control program (2), arc tubes of the same quality can be produced efficiently with a yield. It can be well formed and eliminates the need for proficiency.

7) Embodiment of the present invention FIG. 3 is a diagram schematically showing an electrical sealing apparatus according to Embodiment C2 of the present invention.

In other words, 1 in the figure is a case, and inside this case 1 is an unsealed luminous tube, which is the workpiece, as shown in Figure 2 (Hata).
The light-emitting VTG material 2 shown in FIG.
An arc tube support mechanism, that is, a chuck mechanism 2, is fixed to make the axial center line of b parallel to the voluntary force direction and to selectively support it via the polarizing insertion cylinder section vb located below. . The chuck mechanism 2 is configured to be variable in position in the direction indicated by arrow 3 in the figure.

Therefore, a laser beam irradiation ami is provided which irradiates a laser beam toward the outer peripheral surface of the electrode insertion portion w Va located above the arc tube material 2 supported by the chuck mechanism 2.

This laser beam irradiation device is constructed as follows.

That is, the laser beam A'41 sent out from the laser if5 such as a carbon dioxide laser oscillator tube: Once reflected by the reflection m6tl2, the emitted light is guided to the side of the 7 arc tube material 2 and to the axial line extension of the system material 2, This is reflected in a direction perpendicular to the axis line by reflection #, 7, and then guided in a direction parallel to the axis line by reflection fIm8, and then passed through reflection @9 to the arc tube cable 2.
The electrode is guided to the circumferential surface of the electrode insertion cylindrical portion v1. The reflecting mirror 2 and the reflecting mirror 8 and the reflecting mirror 8 and the reflecting mirror -9 are connected by cylinder bodies 10.11, respectively. A cylindrical body 12 that is coaxial with the reflector 6 and faces toward the reflecting mirror 6 is connected to the cylindrical body 12 . The Koki cylinder body 12 is rotatably supported by the case 1 via a bearing 13.

A wheel 14 is fixed to the outer periphery of the upper end of the cylindrical body 12, and this gear 14 is connected via a gear 16 to the rotating shaft of a motor 16, which is fixed to the case 1.

The reflection 119 is configured to rotate the direction of reflection, and is specifically constructed as shown in FIG. That is, the supporting member 12 (2) is fixed to a bin 181 in a direction perpendicular to the plane of the paper, and the reflecting mirror support plate 18 supports the reflecting mirror body 9 with the bin 18. 19 is rotatably supported. Iron pieces jOi and Job are attached to symmetrical positions of the mirror support plate 19 with respect to the bin 18 in such a manner that they protrude outward. At opposing positions, magnets 21m and 21b formed by winding a coil around the outer circumference of an iron core are fixed to the support member 17.Furthermore, at the center of the back surface of the mirror support plate 19, a rod-shaped body 22 is fixed to the support member 17. is vertically protruding, and bent portions 23m are formed on both sides of the rod-shaped body 22 and the support member 17 centered on the rod-shaped body 22.
, 23b, coil springs 15m, 25b are mounted symmetrically through adjustment screws 14m, 24b.

The wire ends of the coils of the electromagnets 11m and 21b are connected to the outer peripheral surface of the cylinder 12 via a four-core cable (not shown) arranged along the outer surface of the cylinder 11.10. It is connected to four sliding rings 26 made of four electric materials in a one-to-one relationship. Four contacts 27 are provided in the above-mentioned four sliding rings 26 in a constant contact state, and these priests 27 are connected to a power supply device imps that alternately and intermittently energizes the coils of the front electromagnets 11m and 21b. has been done.

On the other hand, above the arc tube material 2 supported by the chuck mechanism 2, an electrode member B- (this member is shown in FIG. External lead wire as shown.

A foil material and an electrode are connected in series in advance. ) is arranged, and this member 3J is supported by the case 1 via a support member 32 provided parallel to the direction of gravity. In this way, the support member 32 is provided so as to cross the irradiation path of the laser beam A, and the thickness of this crossing portion in the direction perpendicular to the power direction is less than 0.5, as shown in FIG. Both sides are shaped like a knife.

Further, the support member 32 is made of metal such as aluminum, copper, or phosphor. Then, the support member 32
At an intermediate position, the arc tube material 2 is placed in a chuck a as described above.
A thin tube 33 is provided in a protruding manner, the tip of which can be fitted into the cavity U of the arc tube material Z through the exhaust tube section X and exhaust port W when supported by the m structure 2. As shown in an enlarged view in FIG. 4, this thin tube 33 has a gas discharge port 34 on the upper surface of its tip.

34b is provided, and a pipe 35.b is provided at the proximal end thereof.
It is connected to an inert gas cylinder 32 via a pulp 36.

Further, below the chuck mechanism 2, there is provided a pinch mechanism LA for selectively pinch-sealing the electrode insertion cylinder part 1 located above the arc tube material 2 supported by the chuck mechanism 2. . This pinch mechanism 11 is movable up and down in the direction indicated by an arrow 39 in the figure, and the electrode insertion tube portion v
It has a pincher 40 that can selectively clamp the chuck mechanism 2 with a strong force, and the pincher 40 is normally used to hold the chuck mechanism 2.
When the pin charger 40 is located at a lower position and pushed up by the hydraulic piston 41, the pin charger 40 becomes
It rises to the top position, and in this state, the electrode insertion cylinder part Va
The hydraulic piston 4 is configured to firmly clamp the fixed position of the hydraulic piston 4 and release the clamping operation when the hydraulic piston 4 starts to descend toward its original position. And the hydraulic piston 41
is controlled by a hydraulic controller 42.

Therefore, the operation period of the laser tube 5 and the operation start and operation period of the pinch mechanism L1 via the hydraulic controller 42 are controlled by the control @rt4S to the relationship described later. In addition, 51 in FIG. 3 is He-Na for positioning.
A laser tube such as a laser oscillation tube is shown, and the laser beam C emitted from this laser tube 51 is reflected by passing along the optical axis of the laser beam A via a reflecting mirror 52 that can be slid to the positions indicated by solid lines and broken lines in the figure. The mirror 6 is irradiated with light.

Next, an example of use of the sealing device configured as described above will be explained.

First, the arc tube material Z shown in Figure 2 (a) (2): t'$3
As shown in the figure, it is supported by the chuck S structure 2.

At this time, the tip of the thin tube 33 is supported so as to be located exactly within the cavity U of the arc tube system material 2.

Next, the electrode insertion cylinder part ■1 located above the arc tube cable material 2
Suspend the electrode member B inside, and the upper end of this member B
It is supported by the pole suspension holding member 31. Next, the reflecting mirror 52
Slide the laser tube 5 to the position indicated by the broken line, and in this state
1 is operated, and the laser beam C finally irradiates the central side surface of the foil material forming the unipolar member B'l@ through the reflecting mirror 9, and in this state, the unipolar member B'l@ The height of the chuck m1llt and the height of the hanging holding member 3 are adjusted so that the relative position of the chuck m1llt is maintained at a predetermined position. Next, the reflecting mirror 52 is returned to the position indicated by the solid line, the operation of the laser tube 51 is stopped, and the motor 16 is then started to operate.
Turn on the output switch 8. When the tube 16 rotates, the cylinder body 12 rotates in the direction indicated by the solid line arrow 61 in the figure, so the reflector 9 also rotates in the direction indicated by the arrow 6, centering on the axis of the arc tube material 2. When the four-source device 28 starts outputting output, the four magnets 211 and 21b of the reflector 9 are alternately and intermittently energized, so that the reflector support plate 19 is rotated in the fourth direction. It rotates as shown by a solid arrow 62 in the figure, and the reflecting mirror main body 91 also rotates in the same direction accordingly. Incidentally, this rotation angle can be easily changed by changing the distance between each iron core of the electromagnets 21m, 21bO) and the iron pieces 10m, 20b.

Next, the pulp 36 is opened 1'' to allow inert gas to flow through the thin tube 33 into the luminescent material Z, and then a start command is given to the control device 43.

When a start command is given, the control device 4s first
The laser tube 5 is controlled to the operating state c:. As a result, laser light A is sent out from the laser tube 5, and this laser light λ is irradiated onto the electrode insertion portion V located above the arc tube material 2 via the reflecting mirrors 11, 7, 8.9. Ru. At this time, since the reflecting mirror main body 91 of the reflecting mirror 9 is rotating as described above,
As shown in FIG.&I44, the outer surface of the electrode-inserted chest V is irradiated with the radar light A in the same axial direction determined by the above rotation angle. In addition, since the reflecting mirror 9 rotates around the axis of the light-emitting wood 2, the magnetic pole insertion tube portion Va is irradiated with the laser over the entire outer circumferential surface with the above-mentioned width, and this irradiation is The affected area will soften uniformly. Note that the support member 32 is positioned so as to cross the optical path of the laser beam A, but since the support member 32 is formed to be sufficiently thin as described above, its enclosure is not visible.

When a command is given to sufficiently soften the electrode insertion tube portion Va, the hydraulic controller 2 operates the hydraulic piston 4. As a result, the pincher shock 40 rises, and the pincher shock 40 clamps the L-shaped electrode insertion cylinder part Vm at a position raised to the side of the electrode insertion cylinder part Va, as shown in FIG. By this clamping, electrode insertion 1%llI part Va
is sealed with the electrode member B embedded inside.

After a predetermined period of time has elapsed, the control device 43 controls the hydraulic controller 4.
The supply of operation commands to 2 is discontinued. As a result, the pressure within the hydraulic piston 41 decreases and the one-bin stopper 40 opens, and in this state it descends to the position shown in FIG. 3, that is, the original position.

At this point, the temperature of the magnetic pole insertion tube portion Va has decreased, so the valve 36 is "closed" and the sealing work on one side is completed here. Next, place the arc tube cord material zt-duck Jll so that the unsealed magnetic pole insertion cylinder part vb is located on the upper side.
Sakaki 21: Reset and complete the sealing work by performing the above-mentioned operation again.

In this case, the use of laser light as a heating source and the passage of inert gas through the arc tube material Z during heating combine to cause the shape deformation of the discharge space to occur. Sealing can be carried out without causing damage or deteriorating the quality of one pole, and the above-mentioned effects can be obtained after all.

8) Modification of the present invention In the embodiment described above, the luminescent material 2 is attached to the chuck 4m2.
Although the setting of the *m member B and the *m member B to the electrode (1) lowering and holding member 31 are performed manually, an automatic setting configuration may be used.

In addition, control of the pulp 36, positioning control, motion 16
The control device 43 may also control the power source device and the source device.

[Brief explanation of the drawing]

Figure 1 is a side view of an example of an arc tube for a canal light, Figure 2 (a)
, (b) is a diagram for explaining a general method of making a luminous tube for an open-air lamp, and Figure 113 is a diagram showing a seal 41 according to an embodiment of the present invention.
FIG. 4 is a side view of the reflector located at the final stage in the laser beam irradiation device of the same device, FIG. 5 is a cross-sectional view along arrow E-8 in FIG. The figure shows E in Figure 3 at the time when the pincher-shock performs the pinching action.
-g@cutaway view. 2... Arc tube material, U... Cavity, Va, Vb...
- Electrode insertion cylinder part, X... Exhaust ms, BL-magnetic pole member, 2... Chuck ms, 4... Laser light irradiation ytm
. 3 No.... Magnetic pole suspension holding member, 3.2... Supporting member, 33... Thin tube, 37... Inert gas cylinder, 38
...Pinch f*4#, 4:9...Control device. Figure 1 Figure 2 (a) (b) Figure 4! Figure 5

Claims (4)

[Claims] (1) A cavity forming a discharge space, a pair of electrode insertion cylindrical parts connected symmetrically and coaxially to the cavity, and a wall of the cavity. an arc tube support mechanism that supports an unsealed arc tube consisting of an exhaust port via a magnetic pole insertion cylinder located on the lower side with the axes of the pair of electrode insertion cylinders parallel to the direction of gravity; A machining laser beam is irradiated while rotating the outer peripheral surface of the magnetic pole insertion cylindrical portion located above the arc tube supported by the arc tube support mechanism to soften the processing laser beam receiving portion of the cylindrical portion. A rotating irradiation type laser beam irradiation device and the magnetic pole insertion 1
A portion of the arc tube is located above the arc tube, the part of which is provided so as to partially cross the laser beam path that rotates and irradiates the outer peripheral surface of the i1 portion, and the projected width of this portion is sufficiently smaller than the beam diameter of the laser beam. Inert gas is supplied through the exhaust port to a holding part fixed to a stationary part that suspends and holds a magnetic pole member in the electrode insertion cylinder part and to the luminescent inlay supported by the luminous tube support mechanism. an inert gas supply device for pinch-sealing the electrode insertion tube portion of the arc tube supported by the arc tube support mechanism and irradiated with the laser beam when an operation command is given; An electrode pair 4 device for an arc tube for a discharge lamp, comprising: a control device for operating at least the laser beam irradiation device and the pinch mm in a predetermined order. (2) The laser beam irradiation device irradiates the 'magnetic pole insertion cylinder part with a laser beam while scanning the laser beam in the vertical direction with a predetermined amplitude. Pair of electrodes for arc tubes for discharge lamps as described in Section ***. (3) The electrode sealing device for an arc tube for a discharge lamp according to claim 1, wherein the support member has a thickness of 0.5 - or less in a direction perpendicular to the direction of gravity. (4) The electrode of an arc tube for a discharge lamp according to claim 1 or 3, wherein the supporting member is made of one of aluminum, copper, and phosphor bronze. Sealing device.