JPS5994355A - Sealing system for discharge lamp - Google Patents

Abstract

PURPOSE:To provide sufficiently high vibration resistance against vibration or external force in any direction, by providing a glass member arranged between a pair of metallic caps and metal disc or current collecting disc arranged between each metallic cap in front and rear of glass body. CONSTITUTION:A front metal cap 4 where an electrode supporting conductive rod 3 is penetrating forwardly on the axis, metal disc 9 inserted through open end of said cap 4 and secured with the rear end of said rod 3, glass body 6 arranged at the rear of said disc 9, current collecting disc 9A arranged at the rear of said body 6, rear metal cap 4A covering the rear end section of said disc 9A and said body 6 and a plurality of conductive foils 5 arranged along the circumference of said body 6 having both ends connected electrically to said caps 4, 4A and discs 9, 9A are provided in the neck section 1A of glass encapsulator 1 then said body 6, conductive foil 5 and neck section 1A are welded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a discharge lamp sealing device, and in particular,
The present invention relates to a discharge lamp sealing device that can strengthen the strength against external vibrations, improve manufacturing efficiency, and reduce costs.

In discharge lamps that have a quartz glass envelope with xenon, mercury, etc. sealed inside at high pressure, the mechanical strength of the seal part is not sufficient, so the seal part may crack or break during transportation or use. There is a drawback that it is easy to do.

For this reason, various sealing devices having vibration-resistant structures that are strong against external vibrations have been proposed.

FIGS. 1 and 2 are cross-sectional views showing a conventional discharge lamp sealing device intended for such a vibration-resistant structure.

In FIG. 1, numeral 1 is a glass enclosure in which a discharge lamp electrode 2 is housed and which has a narrow cylindrical neck portion 1A at its end; It is a coaxially arranged, almost columnar glass rod.

The glass rod 16 has supporting blind holes 11, 12 formed in its front and rear end surfaces, which coincide with its central axis.

14A and 14B are fixed to the front and rear end surfaces of the glass rod 16, respectively, and form the blind hole 11.

It is a metal cap (molybdenum, tungsten, tantalum, etc.) with a central hole drilled in line with 12.

5 is arranged along the circumferential surface of the glass rod 16,
It is a conductive foil (such as molybdenum) whose both ends are conductively connected to the metal caps 14A and 14B.

3 is the metal cap 14. A supporting conductive rod 7 passes through the center hole of the metal cap 14B, has its rear end inserted into the support blind hole 11, and has the electrode 2 fixed to its front end. This is an external lead rod that passes through the support hole 12 and inserts its front end into the support blind hole 12.

In addition, in FIG. 1, the supporting conductive rod 3 and the metal cap 14. A, and the external lead rod 7 and metal cap 14
B are fixed by welding or the like. In addition, the glass rod 16, the conductive foil 5, and the neck portion 1A are
Heat welded and sealed.

In the sealing device shown in FIG. 1, the support conductive rod 3 and the external lead rod 7 are inserted into the support blind holes 11 and 12 of the glass rod 16, and the metal cap 14A is inserted.

14B, the vibration resistance against vibrations and external forces in the central axis direction of the conductive rod 3 and the external lead rod 7 is considerably strengthened.

However, when vibration or external force is applied in a direction perpendicular to the central axis, stress is concentrated on the bottoms and openings of the blind holes 11 and 12, and these parts are likely to be damaged.

As a sealing device for improving the above-mentioned drawbacks, a configuration as shown in FIG. 2 can be considered. In this figure, the same reference numerals as in FIG. 1 represent the same or equivalent parts.

In this figure, reference numeral 15 denotes a stem portion, which is formed, for example, by filling the same type of glass as the seal 1 inside the neck portion 1A in front of the metal cap 14A.

In the case of FIG. 2, since the stem portion 15 is provided, as is clear, the vibration resistance against vibrations and external forces in a direction perpendicular to the central axis of the conductive rod 3 is greatly improved.

However, in this case, the length of the supporting conductive rod 3 interposed between the stem portion 15 and the electrode 2 is shortened, so when the electrode 2 is heated to a high temperature, the temperature of the stem portion 15 increases,
There is a risk that the glass that makes up that part will devitrify and become weakened.

As is well known, when glass devitrifies, its mechanical strength deteriorates significantly and its vibration resistance decreases.

Furthermore, in both cases of FIG. 1 and FIG. 2, the blind holes 11 and 12 must be precisely drilled on the central axis of the glass rod 16, which makes the machining troublesome and reduces the yield. There is a drawback that the cost decreases and the cost increases.

The present invention was made in view of the above-mentioned circumstances, and its purpose is to have sufficiently high vibration resistance against vibrations and external forces in any direction, and to be able to withstand vibrations and external forces in any direction. It is an object of the present invention to provide a discharge lamp sealing device that does not require precision machining and is easy to handle during the manufacturing process.

In order to achieve the above object, in the present invention, the discharge lamp seal part has an outer shape approximately equal to the internal cross-sectional shape of the neck part, and has openings facing each other toward the rear and the front. A pair of metal caps are disposed within the neck portion, and a conductive rod for supporting an electrode and an external lead rod are fixedly fixed on the central axis thereof so as to extend forward and backward, and between the pair of metal caps. A metal disk and a current collecting disk are arranged between the arranged glass tombs and each metal cap before and after the glass body, and a metal disk and a current collecting disk are arranged along the circumferential surface of the glass body, and both ends thereof are arranged. It is composed of a plurality of conductive foils electrically connected to each of the metal caps, the metal disk, and the current collecting disk.

Furthermore, in the present invention, in addition to the above-described configuration, the electrode supporting conductive rod is inserted through a hole provided in front of the metal cap and provided approximately at the center thereof, and the periphery thereof A reinforcing support disk or metal cap is added which is pressed against the inner surface of the neck portion.

The present invention will be described in detail below with reference to the drawings. Third
The figure is a sectional view of one embodiment of the present invention.

In the figure, the same reference numerals as in FIGS. 1 and 2 represent the same or equivalent parts.

In FIG. 3, reference numeral 6 denotes a glass chain disposed inside the neck portion 1A, and numeral 9 denotes a metal disk disposed on the front side of the glass chain 6, substantially coaxially therewith.

4 is a front metal cap (tungsten cap) disposed in front of the glass chain 6 and metal disk 9 with its opening facing backward and the glass chain 6a and metal disk 9 inserted into the opening. , molybdenum, tantalum, etc.).

Moreover, 9A is a current collection disk arranged behind the glass continuous body 6 and substantially coaxially therewith.

A rear metal member 4A is disposed behind the glass chain 6 and current collecting disk 9A with its opening facing forward and with the glass chain 6 and current collecting disk 9A inserted into the opening. It's a cap.

As clearly shown in the figure, the supporting conductive rod 3 and the external lead rod 7 are connected to the front metal cap 4 and the metal disk 9, as well as the current collecting disk 9A and the rear metal cap 4A.
are penetrated through holes provided in the centers of the respective parts, and are fixed to each part by means such as welding.

Reference numeral 8 denotes four parts formed by the neck part 1A being pulled in at the front end of the metal cap 4 during heat-welding sealing.

Note that, as will be clear from what will be described later, the four portions 8 are not necessarily required, and may be prevented from occurring.

The embodiment device shown in FIG. 3 is assembled, for example, by the following steps.

(1) Supporting conductive rod 3 with electrode 2 fixed to the front end
Insert the rear end into the center hole of the front metal cap 4 and the metal disk 9, as shown in FIG.
The rear end is fixed to the metal disk 9 by welding or the like.

(2) so as to extend toward the open end side of the front metal cap 4;
A plurality of strip-shaped conductive foils 5 are fixed to the outer periphery or bottom of the metal disk 9 by welding or the like.

(3) Insert the lath 6 made of the same type of quartz glass or the like as the enclosure 1 fully from the open end side of the front metal cap 4 so that the conductive foil 5 is aligned along the circumferential surface of the glass 6. The supporting conductive rods 3 and the front metal cap 4 are fixed together by welding or the like.

(4) Bringing the current collecting disk 9A into which the external lead rod 7 is inserted and fixed into its center hole into contact with the back surface of the glass chain 6;
The conductive foil 5 is fixed to the periphery of the current collecting disk 9A by welding or the like.

(5) Rear metal cap 4A, current collecting disk 9A,
The ends of the glass chain 6 and the conductive foil 5 are fully pressed from the open end side and fixed to the external lead rod 7 so that the end parts of the glass chain 6 and the conductive foil 5 are housed inside.

(6) Electrode 2 - Supporting conductive rod 3 - Front metal cap 4 - Metal disk 9 - Conductive foil 5 - Glass link 6 configured by the above steps (1) to (5) and integrated.
- Current collecting disk 9A - Rear metal cap 4A - Electrode assembly of external lead rod 7 is attached to neck part 1A of glass enclosure 1.
Insert it inside and position it.

(7) Heat and weld the electric conductor 8i assembly and the neck portion 1A from the outside, and weld and integrate the neck portion IA, the conductive foil 5, and the glass continuous body 6 to complete a heat and pressure seal.

Since the present embodiment has the above-described configuration, the electrode 2 iJ3 and the supporting conductive rod 3 can be supported sufficiently firmly by the metal disk 9 and the front metal cap 4, and the supporting conductive rod 3 can be supported sufficiently firmly. With respect to vibrations and external forces in the direction of the central axis, it is possible to provide vibration resistance equal to or higher than that of the conventional technology.

In addition, even when vibration or external force is applied in a direction perpendicular to the central axis, stress is not directly applied to the glass chain 6, and furthermore, the outer circumferential surface of the front metal cap 4 and the neck portion 1
Since the inner surface of A is in contact or pressure contact (not welded or fixed), stress due to vibration or external force is dispersed over almost the entire outer peripheral surface of the metal camp 4.

Therefore, the vibration resistance of the seal portion is improved and its damage is significantly reduced.

Furthermore, in this embodiment, the front power distribution 8i assembly is sandwiched between the front and rear metal caps 4 and 4A, so that it is quite firmly integrated, making it easy to handle during the manufacturing process. , increase manufacturing efficiency,
Product yield can be improved.

FIG. 4 is a sectional view of another embodiment of the present invention, in which the same reference numerals as in FIG. 3 represent the same or equivalent parts. As is clear from the comparison with FIG.
A reinforcing support disk or metal cap 15A has been added to the illustrated embodiment.

The reinforcing support disks or metal caps 15A pass through the supporting conductive rod 3 at their center holes and are fixed to each other with a hole, and their peripheral edges are pressed against the inner periphery of the neck portion 1Δ.

Therefore, according to this embodiment, the choreography resistance against vibrations and external forces in a direction perpendicular to the central axis of the supporting conductive rod 3 can be further improved.

As is clear from the above description, according to the present invention, a discharge lamp sealing device having sufficient strength against externally applied vibrations and forces can be realized.

In addition, in the embodiments shown in FIGS. 3 and 4, the conductive foil 5
Of course, one or both of the front end and the rear end of the cap may be fixed to the outer periphery of the metal caps 4, 4A on the corresponding side, or to the bottom surface of the metal disk 9 or the current collecting disk 9A. be.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a conventional discharge lamp sealing device.
FIG. 2 is a sectional view showing another example of a conventional discharge lamp sealing device, FIG. 3 is a sectional view of one embodiment of the present invention, and FIG. 4 is a sectional view of another embodiment. 1...Glass enclosure, 1A...Cylindrical neck part, 2...
・Discharge lamp electrode, 3... Conductive rod for support, 4... Front metal cap, 4A... Rear metal cap, 5... Conductive foil, 6... Glass body, 7... External Ri~do bar, 9
...Metal disk, 9A...Current collecting disk, 15
A... Reinforcement support disk agent Patent attorney Michihito Hiraki and one other person Figure 1 Figure 3

Claims (1)

[Claims] (1) A glass envelope having a cylindrical neck portion;
having an outer shape approximately equal to the internal cross-sectional shape of the neck portion;
a front metal cap disposed in the neck portion so as to open rearward, and having a conductive rod for supporting an electrode passed through the neck portion so as to extend forward;
inserted into the front metal cap from the open end side,
A metal disk to which the rear end of the conductive rod for supporting the electrode is fixed, a glass chain disposed behind the metal disk, a current collecting disk disposed behind the glass chain, and the inside of the neck part. a rear metal cap having an outer shape approximately equal to the cross-sectional shape, opening toward the front, and covering the rear end of the current collecting disk and the glass bar; It is characterized by comprising a plurality of conductive foils having both ends conductively connected to at least one of the metal caps, metal disks, and current collecting disks, and the glass chain, the conductive foils, and the neck portion being welded. Discharge lamp sealing device. (a) Patent (3) A glass seal having an approximately cylindrical neck portion, characterized in that an external lead rod extending rearward is fixed approximately on the central axis of the current collecting disk and rear metal cap. A conductive rod for supporting an electrode is disposed in the neck portion so as to have an outer shape substantially equal to the internal cross-sectional shape of the neck portion and open toward the rear, and a conductive rod for supporting an electrode is located on the central axis of the neck portion and faces toward the front. a front metal cap extending through the front metal cap; a metal disc inserted into the front metal cap from the open end side to which the rear end of the electrode supporting conductive rod is fixed; and the metal disc. a glass continuous body disposed behind the glass tomb, a current collecting disk disposed behind the glass tomb, having an outer shape approximately equal to the internal cross-sectional shape of the neck portion, opening toward the front; a rear metal cap that covers the rear end of the electrical disc and the glass assembly; and a rear metal cap that is disposed along the circumferential surface of the glass assembly, with both ends connected to at least one of the metal caps, the metal disc, and the current collecting disc. a plurality of conductive foils t conductively connected, disposed in front of the front metal cap;
The electrode supporting conductive rod is inserted and fixed approximately in the center thereof,
A discharge lamp sealing device comprising: a reinforcing support disk whose periphery is pressed against the inner surface of the neck portion, and the glass link, the conductive foil, and the neck portion are welded together. (4) A patent characterized in that an external lead rod extending rearward is fixed substantially on the center axis of the current collecting disk and the rear metal cap.