JP4555591B2 - Manufacturing method of single-end discharge lamp - Google Patents

Description

  The present invention relates to a novel single-end discharge lamp, and more particularly to an optimum manufacturing method of a micro single-end discharge lamp.

Conventionally, single-end discharge lamps have been manufactured by the following method.
(a) Using an envelope whose apex is formed in a hemisphere and the other end is open, an exhaust pipe is connected to the hemisphere apex,
(b) An electrode mount in which a pair of electrodes are arranged in parallel is inserted into the envelope, the pair of electrodes are arranged in a hemispherical apex portion, and the power supply portion of the electrode mount is elastically contacted in the envelope. Temporarily fix the mount inside the envelope,
(c) A hemispherical apex portion is formed into a hollow spheroid while flowing an inert gas such as argon gas, and this portion is used as a light emitting portion in which a pair of electrodes are arranged side by side, and the light emitting portion The base side part of the electrode is sealed, and a metal foil constituting the power supply part of the electrode mount is embedded in the sealing part,
(d) The method of sealing the necessary filling (mercury or iodide) using the exhaust pipe, sealing the xenon gas in the light emitting part, and then sealing the root of the exhaust pipe was generally used. .

  A single-ended discharge lamp manufactured using such an exhaust pipe bursts from the connection part of the exhaust pipe with the largest residual strain due to (1) the high pressure in the light-emitting section during lighting (in this case, 60 atmospheres or more). (2) Since the thickness of the sealed part of the exhaust pipe is not uniform, the light coming out of it will be distorted, making it unsuitable as a light source for optical equipment designed based on precision optical design. (3) In addition, due to the uneven thickness, the focus of light is disturbed and the light utilization rate is reduced.

With the advancement of demand for single-end discharge lamps, elimination of the above disadvantages is required for single-end discharge lamps, and finally a so-called chipless single-end discharge lamp manufacturing method that does not use an exhaust pipe has been invented (OSRAM Patent; -186530). This method
(a) Inserting an electrode mount in which a pair of electrodes are arranged side by side into a tubular envelope with one end closed and the other end open, and arranging and arranging a pair of electrodes side by side at the closed end to be a light emitting part The temporary fixing member attached to the part is brought into elastic contact with the envelope and temporarily fixed.
(b) Filling the closed end to be the light emitting part with a necessary filler such as mercury or iodide,
(c) While the light emitting part is cooled with liquid nitrogen or the like, the whole base side of the light emitting part that becomes the sealing part is ignited and softened,
(d) The light emitting portion is formed to have a spheroid shape, and a metal foil constituting a part of the power feeding portion is embedded in a sealing portion adjacent to the light emitting portion.

JP-A-2-186530 (OSRAM patent)

  As a result, it was possible to eliminate the uneven thickness portion of the exhaust pipe seal (which is also the maximum distortion), which has been a problem in the past. The performance of chipless single-end discharge lamps manufactured by this method cannot be fully addressed. That is, recent precision optical instruments are required to further reduce the size of the light source, to make it a point light source, and to extend the service life, and in conventional chipless single-end discharge lamps, impurities enter the light emitting part during manufacture (the reason will be described later). ), Which caused the blackening phenomenon of the light emitting part and the lamp rupture, and the problem that the lamp life was reduced, and further, the variation in the amount of mercury and iodide filled in the light emitting part was large. Various problems, such as variations in the brightness of the lamp, emerged along with the improvement in performance of precision optical instruments.

In particular, miniaturization of discharge lamps due to the use of point light sources inevitably leads to a reduction in the volume of the light-emitting part, and the aforementioned variations in impurities and fillings have a large effect on lamp performance, eliminating these instability factors. However, it has been recognized that this is a major obstacle to downsizing and point light sources for chipless single-end discharge lamps.

  The present invention has been made in view of such a conventional problem, and an object of the present invention is to develop a method capable of removing as much as possible the contamination of impurities during manufacture into the light emitting part during the instability factor.

Manufacturing method of the single-ended discharge lamp (A) according to "claim 1",
(a) Processing the glass tube (10a) to form a space portion (3a) to be the light emitting portion (3) at the tip of the glass tube (10a) and the inner surface of the space portion (3a) on the base side Forming a sealing body (10) in which the continuous portion (R) of the space portion (3a) is formed in a flat shape with a gap (H) formed therebetween,
(b) A mount (M) composed of a pair of electrodes (1) (2) arranged side by side and a power feeding section (4) (5) connected thereto is inserted into the envelope (10). The pair of electrodes (1), (2) is disposed in the space (3a), and the enveloping body (10) is fed by the power feeding parts (4), (5) connected to the electrodes (1), (2). ) Temporarily fixing the mount (M) in
(c) After heating the flat continuous portion (R), a part of the flat continuous portion (R) is sealed, and the power feeding portions (4) and (5) are primary sealed portions (6) and (7). Forming a filling material supply hole (8) that is sealed inside and communicated with the space portion (3a) along the primary sealing portions (6) and (7);
(d) filling the necessary filler (11) into the space (3a) from the filler supply through hole (8),
(e) a step of sealing the root (10b) of the sealing body (10) located on the opposite side of the space (3a);
( f ) clogging at least a part of the filler supply through-hole (8),
Characterized in that it comprises a.

Manufacturing method of the single-ended discharge lamp (A) according to "claim 2"
(a) Processing the glass tube (10a) to form a space portion (3a) to be the light emitting portion (3) at the tip of the glass tube (10a) and the inner surface of the space portion (3a) on the base side Forming a sealing body (10) in which the continuous portion (R) of the space portion (3a) is formed in a flat shape with a gap (H) formed therebetween,
(b-1) A mount (M) composed of a pair of electrodes (1) (2) arranged side by side and a power feeding section (4) (5) connected to these electrodes is placed in the envelope (10). The pair of electrodes (1) and (2) are disposed in the space (3a), and the envelope is provided by the power feeding parts (4) and (5) connected to the electrodes (1) and (2). (10) temporarily fixing the mount (M) in,
(b-2) filling the space (3a) with the necessary filler (11),
(c) sealing the root (10b) of the sealing body (10) located on the opposite side of the space (3a);
Step (d) you heated and closed busy space portion of the (3a) while cooling the該扁flat continuous portion (R),
Characterized in that it comprises a.

  The above merits will be described below in relation to the conventional example. In the manufacturing method of the chipless single-end discharge lamp described in the conventional example, when the filling is filled in the envelope, and further, the xenon gas is sealed, and then the base side of the light emitting portion is sealed, the sealed cylindrical seal The whole stop part is ignited from the outer periphery to soften the part, and the softened part is pinched and sealed to perform sealing. Heating over a wide range at a temperature above the softening point for a long time is necessary. In other words, it is necessary to soften a wide range from a tubular shape to a crushing seal [= pinch seal]. By this heating, a part of the quartz glass is decomposed, and a large amount of oxygen is released into the envelope or OH groups ooze out on the inner surface of the envelope. In addition, since the tungsten electrode and the molybdenum power feeding portion temporarily fixed in the envelope are heated to the same temperature, the gas occluded in these metal portions is also released into the envelope.

  A part of these impurity gases is confined in the light emitting part in the above-described sealing operation, which causes blackening phenomenon and lamp burst as described in the conventional example. In particular, as chipless single-end discharge lamps are miniaturized and the internal volume of the light emitting part is reduced, the adverse effects of mixed impurities become obvious.

Relative to the present invention as described above which, overall by heating and occlusion of 1 Tsugifutome or during this portion definitive to claim 2 of Bian definitive to claim 1 flat continuous portion (R) (R) seal The sealing time can be significantly shortened compared to the conventional case of sealing a circular glass tube. As a result, mixing of impurities or decomposition products from the continuous part (R) into the light emitting part (3) due to the strong heat of the continuous part (R) is suppressed as much as possible.

Further, Oite to claim 1, the final sealing of the light emitting portion to be executed after the washing of the packing supply communication space due to pores (8) (3a) (3), the filler feed hole (8) The secondary sealing portion (9), which is a very small portion of the portion, can greatly reduce the final sealing time. Therefore, the amount of impurities released from the metal mount (M) composed of the envelope (10) in the final sealing, the electrodes (1) (2), and the power feeding section (4) (5) is greatly reduced. In addition, the contamination of impurities in the light emitting part (3) is greatly reduced. In particular, in this case, in addition to the primary sealing described above, secondary sealing of a very small portion can be performed, so that adverse effects due to heating can be reduced to a minimum.

In addition, any of the steps (b-1) and (b-2) of claim 2 may be performed first.

“Claim 3 ” is a modification of claims 1 and 2 , in which the electrodes (1) and (2) are temporarily fixed in the sealing body (10), and then the power feeding section (4 ) (5) electrode base (K1) (K2) of the flat continuous part (R) that coincides with the electrode base (K1) (K2) A step of embedding and temporarily fixing K2) in the matching portions (R1) and (R2) of the flat continuous portion (R) is further added.

  In addition to the above-mentioned features, the feature here is a step of embedding and temporarily fixing the `` electrode base (K1) (K2) '' in the matching portion (R1) (R2) of the flat continuous portion (R) In the point. In this way, since the electrode base (K1) (K2) is temporarily fixed prior to the pinch seal of the flat continuous part (R), even if the pinch seal of the flat continuous part (R) is performed, it depends on the pressing force at that time There is no displacement of the electrode position. Therefore, a quartz bridge or the like for fixing the electrodes (1) and (2) becomes unnecessary.

  In the above method, after the primary sealing, washing through the filler supply through hole (8) (nitrogen is introduced into the space (3a) through the filler supply through hole (8) while heating the portion to be the light emitting section (3). By supplying and exhausting an inert gas such as argon gas and purifying the space (3a), impurities generated by the primary sealing can be removed from the space (3a).

  Further, in the above method, when the light emitting part (3) is formed by closing the filler supply through hole (8), the final heating part becomes a very limited micro-region, so that the impurities of the final sealing heating can be reduced. Mixing into the light emitting part (3) is extremely limited. On the other hand, when the entire flat continuous part (R) is heated and sealed without forming the filler supply through hole (8), washing of the space part (3a) cannot be performed. The amount mixed into the light emitting part (3) is slightly increased. However, since there is a flat continuous portion (R), the heating time is shorter than when the cylindrical envelope (10) is heated and sealed with a pinch seal. The amount of impurities mixed is reduced.

  The gap (H) formed in the flat continuous portion (R) is formed to have a slightly larger width than the external lead rods (4b) (5b). The cross-sectional shape of the gap (H) may be oval as shown in FIG. 3, or a shape in which a hollow cylinder is formed at the center of the oval, or a thin circular exhaust pipe (8a) may be connected. .

  According to the present invention, since the continuous portion of the space portion that becomes the light emitting portion (this portion becomes the sealing portion) is in a state of being flattened in advance, a part of the flat continuous portion (metal foil The primary sealing part that becomes the embedded part) or the whole is crushed and the distance for primary sealing or whole sealing is only (H), compared to the case of crushing a conventional circular tube Pinch sealing can be easily performed, and the heating time can be greatly shortened. Therefore, mixing of the light emission part of impurities and decomposition substances generated due to high temperature and long time is suppressed, which greatly contributes to quality improvement of the ultra high pressure discharge lamp.

  In addition to this, when performing primary sealing to form a filling material supply hole, after performing impurity removal cleaning in the light emitting part through the filling material supply hole, at least a part of the thin material supply hole is sealed. Since it only stops and closes, this secondary sealing is completed in a short time, and the generation of impurities in the secondary sealing can be greatly suppressed. As a result, the impurities mixed in the light emitting portion can be further greatly suppressed, and the blackening of the light emitting portion, the lamp rupture, and the shortening of the life associated therewith can be solved.

  In conclusion, the major feature of the present invention is that, as described above, the mixing of impurities in the light emitting part is greatly suppressed, so that the mass production of an ultra-compact single-end discharge lamp with a very small light emitting part internal volume is achieved. It was a way of opening up the road.

  In addition, by forming the secondary sealing portion in conformity with the shape of the base side of the light emitting unit, the shape of the base side of the light emitting unit can be a smooth curved surface, and generation of a low temperature part can be eliminated.

  Also, when the electrode base (K1) (K2) of the power feeding part (4) (5) is embedded and temporarily fixed in the matching part (R1) (R2) of the flat continuous part (R), the flat continuous part (R) The electrode position does not shift due to the pressing force during pinch sealing.

  Hereinafter, the present invention will be described in order according to the illustrated embodiments. FIG. 11 is a cross-sectional view of the first embodiment of the single-ended discharge lamp (A) according to the present invention. The envelope (10) has a light-emitting part (3) having a spheroidal or spherical shape or a similar shape at the tip, and the primary seal along the light-emitting part (3) on the base side of the light-emitting part (3). Stop portions (6) and (7) are formed, and are provided along the primary sealing portions (6) and (7). The filler supply through holes (8) communicated with the light emitting portion (3) A secondary sealing part (9) is formed.

  The power feeding part (4) (5) is composed of molybdenum metal foil (4a) (5a) and an external lead rod (4b) (5b) made of molybdenum with one end spot welded to the metal foil. A pair of tungsten electrodes (1) and (2) are spot welded to the other ends of (4a) and (5a). And this pair of electrodes (1) (2) are arranged in parallel inside the light emitting part (3), the metal foil (4a) (5a) connected to the electrodes (1) (2) and its base part are the above-mentioned It is embed | buried under a primary sealing part (6) (7), respectively. The external lead rods (4b) and (5b) are formed by sealing an external lead member (13) bent in a U-shape as shown in FIG. The electrodes (1) and (2) used here are substantially L-shaped as can be seen from FIG. 4, and the ends of the bent ends (1a) and (2a) face each other, and the electrode base ( 1b) and 2b are arranged so as to be parallel to each other.

  In this embodiment (FIGS. 5 to 11 and 16 to 18), the filling material supply hole (8) is formed between the primary sealing portions (6) and (7), and the secondary sealing portion (9). Is formed and communicated with the light emitting part (3), and after the washing of the space part (3a) to be the light emitting part (3) as described later, the necessary filler (11) and xenon gas from here Alternatively, other necessary filling gas such as this is filled. After these are performed, secondary sealing is performed at any point of the filler supply through hole (8). In the illustrated embodiment, secondary sealing is performed along the base side of the light emitting part (3), and the light emitting part (3) has a spheroid approximate shape (of course, the shape of the light emitting part (3) is a spheroid). The shape is not limited to the approximate shape, but may be a spherical shape). Further, the secondary sealing does not have to be formed along the base of the light emitting part (3), and it is sufficient that the filling supply through hole (8) is closed. However, it is preferably formed along the base of the light emitting part (3) for the reason described above that the low temperature part is not formed in the light emitting part (3).

  FIG. 15 shows an example in which the filling portion through-hole (8) is not formed and the entire continuous portion (R) is heat-sealed.

  Next, an example of the manufacturing procedure of the present invention will be described with reference to the drawings. 1 and 2 are drawings of a manufacturing procedure of a sealing body (10) commonly used in the present invention, in which a quartz glass straight tube (10a) is rotated while its central portion is heated and softened. As shown in FIG. 2, the roller (20) is pressed against the softened portion to gradually reduce the diameter, cut from the center, and hemispherical at one end (this portion is the space portion (3a) that becomes the light emitting portion (3)). A sealing body (10) formed at the other end and opened at the other end is formed. Subsequently, the base side of the space (3a) is heated and softened, and the softened part is pressed from both sides with a mold (not shown), and a gap (H) is formed between the inner surfaces. The continuous portion (R) of the space (3a) is formed to be flat. The width and length (space) of the gap (H) are such that the electrodes (1) and (2) of the mount (M) and the subsequent metal foils (4a) and (5a) can pass through and can be embedded with a seal. Is formed.

  Subsequently, the metal foil (4a) (5a) spot-welded to both ends of the external lead member (13) bent in a substantially U shape and the other end of the metal foil (4a) (5a) are spot-welded. The electrode mount (M) composed of the electrodes (1) and (2) is inserted into the envelope (10), and the pair of electrodes (1) and (2) are aligned in the closed spherical end of the envelope (10). The electrode mount (M) is placed in the envelope (10) by elastically contacting the outer lead member (13) formed slightly wider than the inner diameter of the envelope (10) to the inner surface of the envelope (10). Temporarily fix. Here, the electrodes (1) and (2) are arranged in parallel in the space (3a), and the metal foils (4a) and (5a) are in the gap (H) between the flat continuous portions (R). To position.

  When the electrode mount (M) is mounted in this way, the opening end of the envelope (10) is mounted on the exhaust stand (30) and is kept airtight by the 0 ring (31). Subsequently, the exhaust table (30) is evacuated and the inside of the envelope (10) is evacuated, and then an inert gas such as argon gas is enclosed and is heated at a temperature of 1,000 to 1,050 ° C. A necessary part is heated for a predetermined time (about 15 seconds). During this time, argon gas evacuation for cleaning the inside of the envelope (10) → evacuation → argon gas sealing → argon gas evacuation ... the process (so-called washing or flushing process) is repeated several times. The impurities released from the metal electrode mount (M) and the quartz glass envelope (10) into the envelope (10) by the flushing are completely removed from the envelope (10).

  Thereafter, the flat continuous portion (R) coinciding with the metal foils (4a) and (5a) is ignited, and this portion is raised to a temperature of 2,100 ° C. or higher. At this time, the argon gas pressure in the envelope (10) is set so that the argon gas pressure is about 1 atm when heated and expanded.

  When the temperature of the sealing part (F) reaches a predetermined temperature and the heated part is in a softened state, argon gas is additionally sealed in the sealing body (10), and at the same time or immediately after this, the filling material supply hole (8) The softened and sealed portion is pinched by a pair of male and female pinchers (40) and (41) each having a formation groove (42) and (43). This figure is shown in FIGS. 5 to 7, and the softened sealing part is pressed by a part other than the groove (42) (43) [this part is used as a primary pinching part (44)], and the groove (42) (43) The primary sealing is performed while leaving the portion corresponding to the above, and by this primary sealing, the metal foils (4a) (5a) and the base thereof are embedded in the primary sealing portions (6) and (7). Then, as described above, the portion that matches the grooves (42) and (43) is not crushed against the pressing force at the time of pinching by the pressure of the additional sealed argon gas, and the filler supply passage that communicates with the light emitting section (3) is prevented. It remains in the sealing part as a hole (8). In other words, the light emitting part (3) formed by the primary sealing is in communication with the outside through the filling material supply hole (8).

  In addition, since intense heating for a predetermined time is applied to the sealed portion even during the primary sealing, impurities are released from the sealed portion and the metal electrode mount (M) into the sealed body (10) as described above. However, since the sealing part is in a state of being flattened in advance, the distance of primary sealing by crushing a part of this flat continuous part (R) is only (H), Compared with the case where the circular tube is crushed, pinch sealing can be easily performed, and the heating time can be greatly shortened. Since the light emitting part (3) communicates with the outside through the filler supply through hole (8) as described above, the light emitting part (3) is generated during the primary sealing by the flushing after the primary sealing, and the light emitting part (3) Impurities that have intruded into the gas can be completely removed by the filler supply through hole (8).

  During the primary sealing and during the flushing step, the light emitting part (3) is heated to a temperature at which the quartz glass constituting the envelope (10) is not softened at 1,000 ° C. or higher. When the heating temperature of the light emitting part (3) is low, impurities released from the sealing part (F) and metal electrode mount (M) are occluded and accumulated in the light emitting part (3), and blackening after commercialization , It causes defects such as lamp burst or short life. In other words, the temperature of the light emitting part (3) is kept at a certain high temperature during the primary sealing and during the flushing process, and the light emitting part (3) itself is not decomposed, but the sealing part (F) or metal It is an important point of the present invention to maintain a state in which the impurities released from the electrode mount (M) are not occluded.

  After the primary sealing is performed in this manner, the necessary filling gas (11) and the necessary sealed gas such as xenon gas are sealed in the light emitting part (3) through the filling material supply hole (8) (10). Then, the base (10b) of the envelope (10) is heat-sealed and removed (FIG. 12).

  As shown in FIGS. 16 and 17, the light emitting part (3) of the semi-finished product (B) protrudes outside from the shielding plate (50), and the light emitting part (3) is cooled by blowing nitrogen gas, for example, A part of the filling material supply hole (8) is softened and closed (secondary sealing) by a burner flame (61) such as an oxyhydrogen flame ejected from a thin burner (60). At the time of the secondary sealing, since the entire interior of the semi-finished product (B) is in a reduced pressure state, the softened part is naturally blocked by contraction. Of course, it may be pressed from the outside with a pin or the like, and the softened portion may be pushed in and closed. The discharge lamp (A) thus formed is shown in FIG.

  As an alternative to the above, the above-described secondary sealing portion (9) may be formed in this state without performing the above-described fundamental sealing (FIGS. 9 and 10).

  In any case, since this secondary sealing is local heating, the heating time is very short. Therefore, the amount of impurities generated from this secondary sealing part (9) is very small, as shown in the conventional example. The mixing of impurities in the light emitting part (3) is negligible. The sealing length of the secondary sealing portion (9) is sufficient to withstand the pressure increase due to gas expansion in the light emitting portion (3) when the secondary sealing portion (9) is lit. Is about 2 mm. Finally, unnecessary portions of the envelope (10) and the electrode mount (M) are cut off to obtain a finished product shown in FIG.

  In any of the above cases, after the primary sealing, the necessary filling (11) is filled into the space (3a) to be the light emitting part (3) and finally the secondary sealing is performed. Fill the space (3a) with the necessary filler (11), seal the entire flat continuous part (R) at a time while cooling the space (3a), and part of the power feeding part (4) (5) [Generally, metal foils (4a) and (5a)] may be embedded in the sealing portion. In this case, since the other procedures are the same as those described above, the description thereof is omitted (FIGS. 12 to 15).

  FIG. 18 shows another example of the filling material supply hole (8). A thin circular exhaust pipe (8a) [this is a part of the envelope (10)] is provided in the filling material supply hole (8). It is formed in one piece, and the required filling (11) and the required filled gas are sealed in the light emitting part (3) through this exhaust pipe (8a), and the basic sealing before the secondary sealing is also performed. It is performed at the root of the exhaust pipe (8a). Other points are the same as described above.

  Further, in the method of the present invention, after temporarily mounting the mount (M) in the envelope (10), the electrode bases (K1) (K2) of the power feeding parts (4) (5) connected to the electrodes (1) (2) ) Of the flat continuous part (R) that matches the flat continuous part (R) by heating the matching part (R1) (R2) of the flat part (R) to the electrode base (K1) (K2) of the power feeding part (4) (5) A step of embedding and temporarily fixing in (R1) and (R2) may be further added.

  In this way, since the electrode base (K1) (K2) is temporarily fixed prior to the pinch seal of the flat continuous part (R), even if the pinch seal of the flat continuous part (R) is performed, it depends on the pressing force at that time There is no displacement of the electrode position. Therefore, a quartz bridge or the like for fixing the electrodes (1) and (2) becomes unnecessary.

  In conclusion, the major feature of the present invention is that, as described above, the mixing of impurities in the light emitting part is greatly suppressed, so that the mass production of an ultra-compact single-end discharge lamp with a very small light emitting part internal volume is achieved. It was a way of opening up the road.

The front view which shows the heating state of the quartz glass straight tube used for this invention. The front view which shows the state which has deform | transformed the softened part of the straight pipe | tube heated in FIG. 1 with the roller. Sectional drawing of the one end obstruction | occlusion pipe | tube for envelopes of this invention manufactured by FIG. FIG. 4 is a cross-sectional view of a state in which an electrode mount is attached to the sealing body one-end closed tube of FIG. The front sectional view which shows the state which sealed the sealing part of the one end obstruction pipe | tube for sealing bodies in FIG. Sectional drawing of the orthogonal | vertical direction of FIG. XX sectional view of FIG. Sectional drawing of the state which filled the required filling into the semi-finished product primary-sealed. FIG. 9 is a front sectional view of a state where secondary sealing is performed in the state of FIG. 8. FIG. 10 is a side cross-sectional view in the direction perpendicular to FIG. 9. 1 is a cross-sectional view of an ultra-compact single-ended discharge lamp formed by the method of the present invention. Sectional drawing of the state which filled the required filling material into the sealing body. The front sectional view which shows the secondary sealing state of the semi-finished product by which the envelope was fundamentally cut off. FIG. 10 is a side cross-sectional view in the direction perpendicular to FIG. 9. Sectional drawing of the other microminiature single-end discharge lamp formed by the method of this invention. The front sectional view which shows the secondary sealing state of the semi-finished product by which the envelope was fundamentally cut off. FIG. 17 is a side sectional view in a right angle direction of FIG. 16. Sectional drawing of the other Example corresponding to FIG.

Explanation of symbols

(1) (2) Electrode
(3) Light emitting part
(3a) Space
(4) (5) Feeding part
(6) (7) Primary sealing part
(8) Filling supply hole
(9) Secondary sealing part
(10) Enclosure
(R) Flat continuous part
(H) Gap

Claims (3)

(a) The glass tube is processed to form a space portion to be a light emitting portion at the tip of the glass tube, and a continuous portion of the space portion with a gap formed between the inner surfaces on the base side of the space portion A step of forming an envelope formed into a flat shape,
(b) A mount composed of a pair of electrodes arranged side by side and a power feeding section continuous with the electrodes is inserted into the envelope, and the pair of electrodes are disposed in the space, and the power feeding is connected to the electrodes. Temporarily fixing the mount in the envelope at the part,
(c) After heating the flat continuous portion, a part of the flat continuous portion is sealed to seal the power feeding portion in the primary sealing portion and communicate with the space portion along the primary sealing portion. Forming a filler supply through-hole,
(d) filling the necessary filler into the space from the filler supply through-hole,
(e) cutting off the root of the envelope located on the opposite side of the space,
(f) a secondary sealing step of closing at least a part of the filler supply through-hole,
The manufacturing method of the single-end discharge lamp characterized by comprising. (a) The glass tube is processed to form a space portion to be a light emitting portion at the tip of the glass tube, and a continuous portion of the space portion with a gap formed between the inner surfaces on the base side of the space portion A step of forming an envelope formed into a flat shape,
(b-1) A mount composed of a pair of electrodes arranged side by side and a power feeding portion continuous with the electrodes is inserted into the envelope, and the pair of electrodes are disposed in the space portion and connected to the electrodes. A step of temporarily fixing the mount in the envelope at the power feeding unit,
(b-2) filling the space with the necessary filler,
(c) cutting off the root of the envelope located on the opposite side of the space,
(d) heating and closing the flat continuous part while cooling the space part,
The manufacturing method of the single-end discharge lamp characterized by comprising.   After temporarily fixing the electrode in the envelope, the matching portion of the flat continuous portion that coincides with the electrode base portion of the power feeding portion connected to the electrode is heated to embed and temporarily fix the electrode base portion of the power feeding portion within the matching portion of the flat continuous portion. The manufacturing method of the single-ended discharge lamp of Claim 1 or 2 further adding the process to do.

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