JPS62283529A - Sealing of ceramic valve of high pressure discharge lamp anddischarge lamp manufactured thereby - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for sealing a ceramic enclosure (discharge vessel) of a high-pressure discharge lamp, in particular a sodium lamp. At one end it is integrally closed with its own material, and in the process of sealing, the other open end of the enclosure is integrally joined with a ceramic plate, in which the current conductor is enameled. Attached by bond.

The invention also relates to a high-pressure discharge lamp, in particular a sodium lamp, whose ceramic enclosure or bulb (these terms are hereinafter interchangeable) is integrally closed at one end with its own material, the enclosure comprising: Filled with inert gas and additional gas, the ceramic plate is attached to the valve by enamel bonding and the current conductor is attached to the diaphragm.

[Conventional technology]

Recently known high pressure discharge lamps and their manufacturing methods include:
It is known that certain problems exist. The reduction in lamp size and power creates difficulties when the valve is evacuated by an evacuation pump and then sealed. That is, since the lamp does not have an exhaust pipe, it is difficult to maintain a temperature of 1200-1500 °C in the sealing area, but such a temperature is limited by the enamel that integrates the discharge vessel and the ceramic plate that closes it. Required to melt the material. At the same time, at the other end of these small-sized lamps, a temperature of 80° C. must be maintained to prevent the evaporation of additional gases (additives).

The temperature gradient required to meet these requirements is
It is difficult to reliably guarantee a lamp with a nominal rating of 35W at approximately 35W. The reason is that ceramic materials have limited tolerances at such temperature gradients.

In embodiments utilizing exhaust pipes, this problem does not exist, but on the other hand, the relatively large dimensions of the exhaust pipe can be a significant source of heat loss, and as a result, external cooling is necessary to prevent overheating of the ceramic parts. It is said that Known arrangements for ensuring the required temperature of the cooling part require the use of a yoke as a very wide heat reflector, which significantly reduces the luminous efficiency of the lamp.

Patent Publication No. 60-127634 discloses a discharge lamp which reduces the size of the lamp and at the same time eliminates the need for an exhaust pipe, and which, like flat halogen lamps, is pinch-sealed and further fitted with a bulb. A ceramic bulb is provided having a ceramic body for sealing the open end of the ceramic body, a current conductor is attached to the ceramic body, and the ceramic bulb is integrally connected to the enclosure by an annular enamel bond.

[Problem that the invention seeks to solve]

However, such a structure does not allow economical methods for manufacturing high-pressure discharge lamps. The reason is that this annular enamel part has to be melted when the valve and closure are welded together. The heat required to achieve this results in an increase in the pressure of the filling in the valve causing the filling to blow through the molten enamel, in other words, some of the filling material disappears during the manufacturing process. Furthermore, the enamel may be displaced from its position by the escaping filling gas.

It is an object of the present invention to address the above-mentioned problem of a sufficient amount of filling remaining within the enclosure during so-called pinch sealing and forming an enamel bond between the ceramic enclosure and the ceramic closure. An object of the present invention is to provide a method for sealing a ceramic envelope of a discharge lamp.

We assume that if the closure is made of a ceramic plate with a cross-section larger than the internal cross-section of the enclosure and approximately the same cross-section as the external cross-section of the enclosure, then during assembly the plate is placed on the enclosure. It has been realized that in this way the manufacture of the enclosure is simplified. Furthermore, we believe that if a packing ring made of a high melting point elastic material is placed between the abutment surface of the plate and the open end of the enclosure, the enamel bond will form between the enclosure and the plate. It has been recognized that such a ring functions as a backing under the influence of a suitable clamping force between the plate and the enclosure while being formed therebetween. As a result of the sealing function of the metal ring, the filling within the enclosure remains trapped despite its increased pressure during the formation of the enamel bond. The filling does not blow through the molten enamel and displace the enamel from its position.

In order for the metal ring to be a good seal, it must be flexible so that it can be placed stably against the end surfaces of the plate and enclosure. This elastic property must be maintained even at temperatures at the melting point of the enamel. In addition, its coefficient of thermal expansion must match that of the material of the enclosure and plate. It must also resist the corrosive effects of the enclosure filling. These requirements are optimally met by a closed (uninterrupted) metal ring made of niobium (obium). If the material in the discharge space corrodes the metal, the packing ring is provided with a corrosion-resistant layer on the surface facing the discharge space.

Measures for Solving Problem C] With the above recognition in mind, we propose that a ceramic enclosure, especially an alumina enclosure, for high-pressure discharge lamps, especially sodium lamps, be integrally closed at one end with its own material. Researched ways to seal the siege. In the method, the open end of the enclosure is sealed with a ceramic ring by an enamel ring.
/ is sealed in particular in an alumina plate, to which the current conductor is attached in a particularly gas-tight manner, and the enamel ring is melted by heat and then welded with appropriate cooling. Further according to the method of the invention, a closed or continuous elastic gold packing ring is disposed on the inner end (in the sense of facing the interior of the valve) surface of the open end of the enclosure; concentrically outward (in the sense of not contacting the interior of the enclosure) with the backing;
Enamel rings are placed on the open end of the enclosure, plates with current conductors attached are placed on these rings, the cedar plates having a cross-section that exceeds the inside cross-section of the bulb and preferably equal to the outside cross-section of the bulb. The enclosure and plate, filled with inert gas and additional gas (additives), then exert a force (preferably 0.5
While maintaining the pressing force, an enamel bond between the enclosure and the plate is formed by the enamel ring, and then the pressing force is released.

As a result, the enclosure and the plate are integrated in a gas-tight manner.

The discharge lamp produced in this way can be used without an outer enclosure, but may instead be provided with an outer enclosure closed in a gas-tight manner.

In that case, the space between the discharge lamp bulb and the outer enclosure is evacuated or filled with an inert gas.

Preferably, in the production of high-pressure discharge lamps, the ceramic envelope and the ceramic plate have a circular cross-section or a so-called racetrack-like or flattened circular cross-section or an elliptical cross-section. The advantage of a circular cross-section enclosure is that it is easy to manufacture, while the advantage of a racetrack-shaped enclosure is that it is easier to position the electrodes and therefore the heat distribution is more uniform and the stability of the walls is improved. The effect is achieved.

A closed niobium ring of substantially diamond-shaped cross section can be advantageously used as a packing ring.

The ring is positioned such that its diagonally opposite edges abut respectively the end surfaces of the ceramic plate and the ceramic enclosure, so that an air-tight seal is achieved with a relatively small pressure. This can be achieved by pressure.

However, if desired, a closed niobium ring made of sheet material can be used as the packing ring. Such a ring may be arranged between concentric ribs projecting from each other from the end surface of the enclosure and the plate, such that these ribs sandwich the sealing ring. This is particularly advantageous because the niobium ring can be manufactured relatively inexpensively from sheet material and in this way its continuity (without gaps or breaks) can be essentially resolved.

If sealing a valve with a filling containing a metal halide as an additive, the sealing ring should preferably be a niobium ring, which is provided with a halide-resistant layer, e.g. A mixture of oxides is provided on the surface in contact with the interior of the pulp. This layer may be formed simultaneously with the formation of the enamel bond if the enamel ring is made of a halide resistant enamel material. During the heat treatment required to form a good bond, the enamel bond between the plate and the current conductor should not become loose, and in this way the integrity of the plate seal should be maintained. It is desirable to seal and attach the current conductor to the plate with an enamel having a melting point higher than the melting point of the enamel ring used to weld the valve and plate. In order to prevent the current conductors from melting, it is also possible to remove heat through these sealed conductors, so that, for example, the current conductors can be made of an enamel equivalent to the enamel of an enamel ring. It can be fixed in place by.

An advantageous feature of the invention is that the conductor-mounted ramps are not damaged by exposure to the atmosphere at operating temperatures. For example, suitable current conductors are made of steel alloys.

If desired, the sealed discharge lamp may be placed within an external light-transmissive, preferably glass, enclosure. The space between the discharge lamp and the outer enclosure may be evacuated or filled with an inert gas, and the outer enclosure may be hermetically sealed.

For high-pressure discharge lamps with an external enclosure, tantalum current conductors can be advantageously used. In such cases,
The material of the electrode is also tantalum, and in this way the normally required welding between the conductor and the electrode may be unnecessary. When the electrode is tantalum, tantalum
ate) based cathode activation materials are used.

The invention further relates to a high pressure discharge lamp, preferably a sodium lamp, made by the method as described above. The high pressure discharge lamp, preferably a sodium lamp, has a ceramic enclosure, preferably made of alumina, closed at one end by its own material, the open end of the enclosure being closed by an annular enamel bond, preferably made of ceramic, preferably made of alumina. Mounted on an alumina plate, the ceramic plate is hermetically integrated with a current conductor passing through it. Such lamps have an enameled ring made of elastic metal and an inner closed packing ring arranged concentrically between the open end of the enclosure and the plate, and the cross-section of the plate A further improvement is achieved by the fact that is chosen to be larger than the internal cross-section of the enclosure and preferably equal to the external cross-section of the enclosure.

The enclosure of the high-pressure discharge lamp according to the invention preferably has a circular cross-section or a flattened circular cross-section, for example a so-called racetrack-shaped cross-section. Typically, the shapes of the packing ring, enamel ring and plate are chosen to match the cross section of the enclosure.

In a preferred embodiment of the discharge lamp according to the invention, the packing ring is a closed niobium ring with an essentially diamond-shaped cross section (FIG. 1). The niobium ring is attached to the end surface of the enclosure and to the plate.
They abut at their diagonally opposite edges. Upon sealing, the ring is flattened somewhat along the edges, which in this preferred embodiment is essentially diamond-shaped in cross-section.

One preferred embodiment of the discharge lamp according to the invention (FIG. 3)
In , the packing ring is a niobium ring made of sheet material, the packing ring being sandwiched between two members by concentric ribs projecting from each other from the end surface of the enclosure and the adjacent surface of the plate. It is.

A preferred discharge lamp according to the invention has a plate to which the current conductor is attached by means of an enamel which has a higher melting point than the material of the enamel ring. The material of this enamel is 2
Calcium alumina containing ~10% by weight of rare earth oxides and strontium or barium oxides (calc
ium aluminaLe). The melting point of enamel varies depending on its contents.

In one preferred embodiment of the high-pressure discharge lamp with an external enclosure, both the current conductor and the electrodes are made of tantalum, which has the advantage that tantalum matches the material of the plate in terms of coefficient of thermal expansion. .

In a preferred embodiment of the discharge lamp according to the invention: 1 the current conductor projecting outward from the plate can be exposed to air at the operating temperature without risk of damage; In this case, the discharge lamp can be manufactured without an external enclosure and can thus be marketed. However, in this case the material of the current conductor welded to the ceramic plate cannot be the same as the material of the current conductor protruding from the plate, and instead the two metal bodies are external to the enclosure. must be welded close to the plate. The reason for this is that the coefficient of thermal expansion of metals that can be exposed to air without damage does not match the coefficient of thermal expansion of the material of the plate, so that current conductors of, for example, steel alloys cannot be welded to the plate. By disappearing.

〔Example〕

1 to 4 each show a high-pressure discharge lamp as an embodiment of the present invention, and in the figures, the same numerals indicate functionally similar elements.

The conductors 6, 7 for introducing current, forming a single unit with the electrodes 9, 10, are passed through the holes of the prefabricated ceramic plate 5 and are fixed in these holes by enamel bonds 8, thereby The ceramic plate is designed to prevent gas leakage. A filling containing primarily sodium-mercury amalgam (although other mixtures such as metal halides may be added or selected as appropriate from the point of view of the discharge physics used for photodischarge) is inverted. The valve 1 is sealed within the valve 1 arranged therein.

If the filling contains metal halides, a layer 11 of halide-resistant material is placed on the valve surface and this r
fIll is provided on the inner surface of the banking ring so as to be in contact with the discharge space. Furthermore, the enamel used for sealing should also be halogen resistant.

A packing ring 3 and an enamelled ring 4 are placed on the end surface 2 of the enclosure 1, then a plate 5 with a current conductor 6.7 is placed on these rings, the inside of the valve is evacuated and then an inert gas is charged into valve 1. The valve 1 and the plate 5 are then pressed in the direction indicated by the arrow in the drawing, whereby the packing ring 3 deforms and acts as a seal. The magnitude of the pressing force is 1 cm of the edge of the packing ring in contact with the end surface of the valve.
Typically between 0.5 and 1000 Newtons per hour. The pressing force is maintained while the enamel ring 4 is heated and melted. The discharge lamp assembled in this way is cooled and the desired crystal structure and tension or stress is created within the ring 4. In this way, the valve 1 is hermetically sealed to the plate 5 and an enamel bond is formed. When this operation is completed, the pressing force is removed. The packing ring 3 is connected to the bonding ring 3 by the high pressure being applied within the valve 1 during the sealing process, i.e. during the formation of the enamel bond.
to ensure that no molten material is blown away from the location and that no additional material and inert gas is discharged from valve 1.

In the above-mentioned sealing process, the melting point of the enamel 8 is higher than the melting point of the enamel ring 4, so the temporary 5
remains sealed.

When the material of the enamel 8 is the same as the enamel ring 4, during the formation of the joint heat is removed through the current conductor 6.7, preventing the enamel bond 8 from melting.

The discharge lamp produced according to the invention can be provided with an outer bulb, for example made of glass, which is customary for high-pressure discharge lamps. The space between the discharge lamp and the outer envelope may be evacuated or filled with an inert gas.

Although the bulb sealing process according to the present invention is primarily used in the production of low power, high pressure discharge lamps, it can also be used for high power or high power light sources with outputs on the order of kilowatts. By utilizing the process according to the invention, bractis that takes full advantage of the thermal gradient tolerances of the ceramic material during manufacture is discontinued. The reason is that the open end of the valve can be reliably sealed in a single operation.

The high pressure discharge lamp produced by the process according to the invention has a bulb made of alumina, one end of which has a closed bottom made of its own material. The shape of the bulb is similar to the glass envelope of a cylindrical incandescent filament lamp;
It may also have a flat cross section as shown in FIG.

In FIG. 2, the bulb 1 has an open end with a flat end surface 2, which is connected to an alumina plate 5 via an inner sealing ring 3 and an outer enamel ring 4.

In what is shown in FIGS. 1 to 4 (particularly FIG. 2), the buffing ring 3 is a gapless niobium-obium ring with an essentially cruciform cross-section. The edges of the packing ring are respectively valve l and plate 5
It is applied to.

The enamel ring 4 is arranged concentrically with the packing ring 3 between the end surface 2 of the bulb 1 and the plate 5 and provides a bond between the bulb 1 and the plate 5 of the discharge lamp.

Current introducing conductors 6, 7 pass through plate 5. The conductor is formed of a metallic material (FIG. 1), and the ends of the conductor are exposed to the atmosphere at the operating temperature of the discharge lamp towards the outside of the plate 5, so as to eliminate the risk of damage due to that temperature. Made of material i.e. alloy steel. The current conductors 6, 7 are sealed in the plate 5 by an enamel joint 8 which has a higher melting point than the enamel ring 4.

A further requirement is made for the discharge lamp shown in FIG. 4, in which case the enamel should also be made of a halide-resistant material, if possible. The current conductors 6, 7 passing through the plate 5 are parallel to each other, but the tips of the electrodes 9, 10 are bent by 906 to face each other. Electrodes 9, 10 do not have radiators. In general,
There is no reason why radiators should not be used if necessary. The material of the current conductors 6, 7 is not necessarily the same as that of the electrodes 9, 1.
0 materials, in such case they must be joined by a fused bond.

If the bulb 1 has a flattened circular cross section, i.e. the second
In the case of a racetrack cross-section as shown in the figures, packing ring 3, enamel ring 4 and plate 5 are typically of the same shape so as to form a matching shape with the valve. When the dimensions and power are predetermined, the electrodes 9, 10 have a wall stabilizing effect (wa) in the discharge lamp.
ll-stable-singing effect) is achieved within the valve.

The discharge lamp according to the invention can be used advantageously in all configurations required for low-power or compact discharge lamps. for example,
It can be used in combination with a suitable electronic ballast circuit instead of a conventional incandescent filament lamp. The filling inside the valve erodes the enamel and forms a bond after a certain amount of time.
is known to cause damage. However, the service life of the discharge lamp according to the invention is increased compared to conventional lamps with only enamel bonds. The reason is that the material in the discharge space cannot come into contact with the enamel due to the insertion of the internal metal packing ring.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of a high-pressure discharge lamp according to the present invention, and FIG. 2 is a view showing a side cross-section and a plan-side outline of a high-pressure discharge lamp having a flattened circular cross section. , FIG. 3 is a cross-sectional view of another embodiment of the present invention having a packing ring made of bent sheet material, and FIG. 4 is a cross-section of a high-pressure metal halide discharge lamp as another embodiment of the present invention. It is a diagram. (Explanation of symbols) 1: Valve, 2: Valve end surface, 3: Packing ring, 4: Enamel ring, 5: Slope (disc), 6.7
: Current conductor, 8: Enamel bond, 9.1
0: electrode, 11: layer of halide-resistant material. Margins below Fig, 2 Fig, 3 0, /-+1 Procedural amendment (spontaneous) 1. Indication of the case 1988 Patent Application No. 102117 2. Name of the invention Method for sealing ceramic pulp of high-pressure discharge lamp and this method Discharge lamp manufactured by 3, relationship with the case of the person making the amendment Patent applicant name: Trumbushram Rezbenitalshashag 4, agent address: Shizukou Toranomon, 8-10 Toranomon-chome, Minato-ku, Tokyo 105 Building Telephone: 504-07211 Tsuna 1 Name: Patent Attorney (6579) Aoki Akino 4゛Nijioka\ (5 others), Ko 5, Subject of amendment / I) 4M table of “Claims” in the specification ′(′j
Column 6 of "Detailed Description of the Invention" of the specification, Contents of amendment (1) The scope of claims is amended as shown in the attached sheet. (2) If "80℃" is written on page 8, line 4 of the specification, r8
0℃ or below.'' (3) On page 12, lines 10 to 13 of the specification, the phrase "closed...disposed on the surface" is replaced with "inward (facing the inside of the valve)". ) A closed or gap-free resilient metal packing ring is placed on the end surface of the open end of the enclosure and corrects. (4) On page 13, line 11 of the specification, after “Fill with inert gas.” “The amount of pressing force applied is determined by the edge of the packing ring that is in contact with the surface end of the valve.” ``The size of the country per country.'' is added. (5) Specification page 14, lines 12-13 and 19
~Correct the phrase “sealing ring” in line 20 to “pa-knocking ring j.” (6) Correct the phrase “valve surface” in line 12 of page 20 of the specification to “packing ring surface.” to correct. (7) The phrase "internal sealing ring" on page 23, lines 7-8 of the specification is amended to read "internal packing ring." (8) On page 23 of the specification, lines 10 to 12, the phrase "as shown in FIGS. 1 to 4...has an essentially cross-shaped cross section" is replaced with " In what is shown in FIG. 4, the packing ring 3 has an essentially square cross-section. 7. List of attached documents (1) Scope of claims 1 copy 2
, Claim 1: A ceramic pulp fiber of a high-pressure discharge lamp, in particular a sodium lamp, in particular an alumina bulb, which is closed at one end by its own material, in which a ceramic plate, in particular an alumina plate, is melted by heat and then A method for sealing a ceramic valve, which is welded to the open end of the valve by a solidifying enamel ring, the ceramic plate being pierced by a current conducting conductor, comprising: an inner closed W packing ring (3); A packing ring and a concentric outer enamel ring (4) are arranged on the end surface (2) of the open end of the valve (1), and a plate (5) with current conductors (6, 7) is connected to these. Placed on the ring, the cedar board has a cross section larger than the inner cross section of the bulb and approximately the same cross section as the outer cross section of the bulb, then the bulb (1) filled with additional and inert gas Preferably 0.5
The packing ring (3) is hermetically coupled to the plate (5) by applying a pressing force of between 1000 newtons and
), and the pressing force is such that the enamel bond deforms the valve (1
) and the plate (5) during the formation by an enamel ring (4), and then the cough pressure force is removed. 2. The valve (1) has a circular cross section or a flattened circular cross section, and a packing ring (3), an enamel ring (4) and a plate (5) of similar shape are connected to the open end (2) of the valve (1). A method for sealing a ceramic valve according to claim 1, wherein the method is arranged on a ceramic valve. 3. A packing ring (3) disposed on the end surface (2) of the open end of the valve (1) is substantially a countersunk niobium closure ring, with a 3. A method for sealing ceramic pulp according to claim 1, wherein the edges of the ceramic pulp abut against the bulb (1) and the plate (5), respectively. 4. The parking ring (3) is a niobium closure ring made of sheet material, and the valves (1) are opposite each other.
3. A method for sealing a ceramic bulb according to claim 1, wherein the ceramic bulb is arranged between concentric ribs projecting from one another from the end surface of the plate (5) and the adjacent surface of the plate (5). 5. Any one of claims 1 to 4, wherein the packing ring (3) is a metal ring and has a halogen-resistant layer on the surface that contacts the inside of the valve (1). Ceramic valve sealing method described in section. 6.8 The plate (5) has an enamel ring (4) and a tani l-
The current conductors (6, 7) are fixed in the plate (5) by an enamel with a melting point higher than that of the enamel ring (4). A method for sealing a ceramic valve according to any one of claims 1 to 5. 7. While forming the enamel pond, heat is removed through the cough current conductor, claims 1 to 5.
The method for sealing a ceramic valve according to any one of the preceding items. 8. The current conductors (6, 7) are made of a metal that can be exposed to the atmosphere without damage at the operating temperature of the lamp;
Claims 1 to 7, wherein these current conductors are mounted on a plate (5) arranged on the end surface (2) via a packing ring (3) and an enameled ring (4). The method for sealing a ceramic valve according to any one of the preceding items. 9. Claim 1, wherein the sealed discharge lamp is disposed within the outer enclosure, the space between the outer enclosure and the discharge lamp is evacuated, and the outer enclosure is hermetically sealed. The method for sealing a ceramic valve according to any one of Items 7 to 7. 10. The current conductor (6°7) is made of tantalum and is mounted in a plate (5) arranged on the end surface (2) via a packing ring (3) and an enamel ring (4). A method of sealing a ceramic valve according to claim 9. 11. An enclosure made of ceramic, especially alumina, having an enclosure sealed together at one end by its own material, filled with an additional and inert gas and with an airtight seal. A high-pressure discharge lamp comprising a ceramic plate fixed to said enclosure by an annular enamel bond so as to form an annular enamel bond, through which a current conductor is attached, the end of the open end of the bulb (1) The temporary (5) connected to the surface (2) has a cross-section larger than the inner cross-section of the bulb (1) and a cross-section approximately equal to the outer cross-section of the bulb (1), and the bulb (1) and the plate (5) A high-pressure discharge lamp characterized in that, between the enamel ring (4) and the enamel ring (4), a flexible metallic packing ring (3) is closed on the inside concentrically. 12, Packing ring (3), Enamel ring (4)
and the ceramic plate (5) has a cross-sectional shape of R4 or more with respect to the ceramic enclosure (1).
High-pressure discharge lamp as described in Section 1. 13. The metal ring is essentially a closed niobium ring with a half-lambda type bearing plate, the diagonal edges of which rest against the ceramic plate (5). A high-pressure discharge lamp according to claim 11 or 12. 14. The packing ring (3) is made of sheet material sandwiched on both sides by concentric ribs projecting from each other from the end surface (2) of the ceramic enclosure (1) and the ceramic plate (5). This is a closed niobium ring,
A high pressure discharge lamp according to claim 11 or 12. 15. Claims 11 to 14, wherein the enamel material (8) sealing the current conductors (6, 7) within the ceramic plate (5) has a higher melting point than the material of the enamel ring (4). The high pressure discharge lamp described in any one of the preceding items.

Claims (1)

[Claims] 1. A ceramic bulb, especially an alumina bulb, of a high-pressure discharge lamp, especially a sodium lamp, which is closed at one end by its own material, is provided with a ceramic plate, especially an alumina plate, which is melted by heat and then A method for sealing a ceramic valve, the ceramic valve being welded to the open end of the valve by a solidifying enamel ring, the ceramic plate being pierced by a current conducting conductor, comprising an inner closed flexible metallic packing ring ( 3) and an outer enamel ring (4) concentric with said packing ring are arranged on the end surface (2) of the open end of the valve (1) and are connected to the current conductors (6, 7).
) is placed over these rings, said plate having a cross-section larger than the inner cross-section of the bulb and approximately the same cross-section as the outer cross-section of the bulb, and then having an additional and inert The valve (1) filled with gas is preferably 0
．． The ring (3) is hermetically bonded to the plate (5) by applying a pressing force of 5 to 1000 newtons to deform the ring (3), the pressing force being such that the enamel bond is between the valve (1) and the plate (5). A method for sealing a ceramic bulb of a high-pressure discharge lamp, characterized in that the pressing force is maintained during formation by an enamel ring (4), and then the pressing force is removed. 2. The valve (1) has a circular cross section or a flattened circular cross section, and a packing ring (3), an enamel ring (4) and a plate (5) of similar shape are connected to the open end (2) of the valve (1). A method for sealing a ceramic valve according to claim 1, wherein the method is arranged on a ceramic valve. 3. The packing ring (3) disposed on the end surface (2) of the open end of the valve (1) is a niobium closure ring of substantially square diamond-shaped cross section; 3. A method for sealing a ceramic bulb according to claim 1, wherein the diagonal edges abut the bulb (1) and the plate (5), respectively. 4. The sealing ring (3) is a niobium closure ring made of sheet material, and the valves (1) facing each other
3. A method for sealing a ceramic bulb according to claim 1, wherein the ceramic bulb is arranged between concentric ribs projecting from one another from the end surface of the plate (5) and the adjacent surface of the plate (5). 5. Any one of claims 1 to 4, wherein the packing ring (3) is a metal ring and has a halogen-resistant layer on the surface that contacts the inside of the valve (1). Ceramic valve sealing method described in section. 6. The plate (5) is placed on the end surface (2) through the enamel ring (4) and the sealing ring (3), and the current conductors (6, 7) are connected to the melting point of the enamel ring (4). 6. A method for sealing a ceramic bulb according to claim 1, wherein the ceramic bulb is fixed in the plate (5) by means of a higher melting point enamel. 7. A method for sealing a ceramic bulb according to any one of claims 1 to 5, wherein during the formation of the enamel bond, heat is removed through the current conductor. 8. The current conductors (6, 7) are made of a metal that can be exposed to the atmosphere without damage at the operating temperature of the lamp;
Claims 1 to 7, wherein these current conductors are mounted on a plate (5) arranged on the end surface (2) via a packing ring (3) and an enameled ring (4). The method for sealing a ceramic valve according to any one of the preceding items. 9. A sealed discharge lamp is disposed within the outer enclosure;
Claim 1, wherein the space between the outer envelope and the discharge lamp is evacuated and the outer envelope is hermetically sealed.
The method for sealing a ceramic valve according to any one of Items 7 to 7. 10. The current conductors (6, 7) are made of tantalum and are mounted in a plate (5) arranged on the end surface (2) via a packing ring (3) and an enamel ring (4). A method of sealing a ceramic valve according to claim 9. 11. Having an enclosure made of ceramic, especially alumina, sealed together at one end by its own material, filled with an additional and inert gas and with an airtight seal. A high-pressure discharge lamp comprising a ceramic plate fixed to said enclosure by an annular enamel bond so as to form an end surface of the open end of the bulb (1), through which a current conductor is attached. The plate (5) connected to (2) has a cross section larger than the inner cross section of the bulb (1) and a cross section approximately equal to the outer cross section of the bulb (1), and the plate (5) is connected to the bulb (1) and the plate (5). A high-pressure discharge lamp, characterized in that it has a flexible, metallic packing ring (3) closed on the inside concentrically with the enamel ring (4). 12, ceramic ring (3), enamel ring (4)
12. The high-pressure discharge lamp according to claim 11, wherein the ceramic plate (5) and the ceramic envelope (1) have a similar cross-sectional shape. 13. The metal sealing ring (3) is a closed niobium ring with a substantially square diamond-shaped cross section, the diagonal edges of which abut against the ceramic plate (5). A high-pressure discharge lamp according to claim 11 or 12. 14. The packing ring (3) is made of sheet material sandwiched on both sides by concentric ribs projecting from each other from the end surface (2) of the ceramic enclosure (1) and the ceramic plate (5). 13. A high pressure discharge lamp according to claim 11 or 12, which is a closed niobium ring. 15. The enamel material (8) sealing the current conductors (6, 7) within the ceramic plate (5) has a higher melting point than the material of the enamel ring (4). The high pressure discharge lamp described in any one of the preceding items.