JPS6079659A - Short arc discharge lamp - Google Patents

Abstract

PURPOSE:To decrease the weight of the anode and increase the shock resistance of a short arc discharge lamp by using molybdenum to form an area the operation temperature of which does not exceeds 2,000 deg.C and by using tungsten to form the remaining area the operation temperature of which exceeds 2,000 deg.C. CONSTITUTION:A lighting device such as a xenon short arc discharge lamp is constituted by sealing an anode 3 and a cathode 4 attached to ends of lead bars 21 and 22 in a quartz glass sealed body 1 consisting of a spherical section 11, cylindrical sections 12 and 13 and narrowed sections 14 and 15 for preventing any deformation of lead bars 21 and 22. Molybdenum is used to form the low temperature area (L) of the anode 3 the temperature of which does not exceed 2,000 deg.C during its operation. While tungsten is used to form the high temperature area (H) of the anode 3 which is the surface area of the pointed end of the anode 3 and the temperature of which exceeds 2,000 deg.C. Owing to the above constitution, it is possible to decrease the weight of the anode 3 remarkably, thereby effectively preventing breakage or the like of the sealed body 1 which might be caused when impact force or similar shock is applied.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to short arc discharge lamps such as xenon short arc discharge lamps.

In general, in a xenon short arc discharge lamp, as shown in FIG.
A lead rod 21.22 extending into the internal space of the +)-r rod 21.22 is hermetically sealed, and an anode 3 and a cathode 4 are provided at the tips of the +)-r rods 21.22 so as to face each other, respectively. The enclosure 1 includes a spherical part 11 surrounding the anode 3 and the cathode 4, and extends horizontally from both sides of the spherical part 11.
It is composed of a cylindrical part 12ζ13 surrounding the lead rods 21 and 22, and further includes an anode 3 in the cylindrical part 12 and j3.
Alternatively, the lead rod 21.2 is placed in the vicinity of the cathode 4.
Small diameters f1514 and l5 are formed in order to prevent displacement of the anode 3 or cathode 4 due to the deformation of step 2. In the figure, reference numerals 51 and 52 indicate caps attached to the sealing portion of the enclosure l.

By the way, for example, in Ken Otani's 7 yota arc discharge lamp with a rated power consumption of 2KW or more, the temperature of the cathode 3 reaches a high temperature of, for example, 2000°C or more, which causes the material storage of the anode 3 to evaporate. A so-called blackening phenomenon that adheres to the inner wall of the enclosure 1 begins to occur. When such a blackening phenomenon occurs, the light absorption rate of the blackened part of the envelope l is considerably higher than that of the non-blackened part, so the light output efficiency of the short arc discharge lamp decreases significantly, and furthermore, the light output efficiency of the short arc discharge lamp decreases. Since the temperature is higher than other parts, distortion occurs in this part, causing problems such as damage to the envelope l. Therefore, it is necessary to use a relatively large anode 3 that is made of a metal that has a low vapor pressure at high temperatures and has a large heat capacity in order to suppress the temperature rise of the anode 3. Conventionally, for example, as shown in FIG. As shown in the figure, a structure made entirely of tungsten is used.

In the figure, there is a glue rod insertion hole for inserting and connecting the beam 31 and the -F wire 21.

However, in a short arc discharge lamp odor having such an anode 3, the anode 3 is large and the specific gravity of the tungsten that constitutes it is extremely high at 19.24. As a result, there is a problem in that it is not possible to obtain sufficient vibration resistance.

In other words, when some kind of mechanical shock acts on the Noyote arc discharge lamp, one part of the anode 3 becomes thick (because of this, the anode 3
A large bending force acts on the lead rod 21 supporting the lead rod 21, which causes the lead rod 21 to bend and collide with the small diameter portion 14 of the enclosure 1 surrounding it, causing cracks in the enclosure 11c or damage to the seal. The body is susceptible to rupture, and its vibration resistance is insufficient. -Flf, it is strongly desired to solve such problems in the case of fish-collecting fishing rods that are easily subjected to large-scale imaging (for example, for use on fishing boats).

The present invention was made against the above-mentioned background, and aims to provide an iodine arc discharge lamp having a lightweight anode and excellent vibration resistance. A region where the temperature during operation does not exceed 2000"C is made of molybdenum, and a region where the temperature exceeds 2000"C is made of tungsten.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In the short arc discharge lamp of this embodiment, the low-temperature region occupying the base end to which the IJ-p rod 21 is connected and the center of the tip are made of molybdenum, as shown in the third section, and the tip is made of molybdenum. A high-temperature region H occupying the outer surface of the anode 3 is formed by providing an anode 3 made of tungsten.

Here, the low temperature range of the anode 3 refers to the range where the temperature does not exceed 2000°C during operation of the iodine arc discharge lamp, that is, when the discharge lamp is lit in a steady state, and the high temperature range ■ refers to the range where the temperature does not exceed 2000°C. refers to the area that exceeds

In this high temperature range Hvc, the diffusion rate of molybdenum relative to tungsten is high, so even molybdenum that exists inside the high temperature range H evaporates relatively easily into the internal space of the envelope l through diffusion. Therefore, not only the surface portion but also the entire high temperature region H is made of tungsten.

The other parts of this embodiment are the same as the arc discharge lamp shown in FIG. 1, so the explanation will be omitted.

According to the above configuration, the low temperature region of the anode 8 is made with a specific gravity (10,
28), the weight of the anode 80 is significantly reduced compared to when only tungsten is used. As a result, even when an impact force is applied to the short arc discharge lamp for some reason, the anode 8
Since no excessive impact force is applied to the lead rod 21 supporting the lead rod 21 or the small diameter portion 14 of the enclosure l surrounding the lead rod 21, the rod 21 is not damaged. Has excellent vibration resistance.

By the way, when the low-temperature region occupies 75 inches of the volume of the electrode 8, if the entire region of the low-temperature region is made of molybdenum, the weight will be reduced by about 35 inches compared to when the entire electrode 8 is made of tungsten. becomes.

Furthermore, since tungsten with a low vapor pressure is used in the high temperature region H of the anode 8, and molybdenum with a relatively high vapor pressure is used only in the low temperature region, the anode 8 as a whole
The amount of evaporation of the materials constituting the lamp is very small, and the blackening of the envelope does not occur. Can be maintained over time.っ'f,') -1%
The molybdenum part that makes up m3 is 20, o o
Since the rate at which molybdenum spreads through tungsten is very small, the normal service life is 1.
In the case of the 1,700-hour non-short arc lamp, molybdenum does not diffuse through the tungsten and reach the surface of the high-temperature region H within this one historical life period, and therefore blackening occurs. This means that it is possible to prevent

The 1-electrode in the present invention is manufactured by first molding the central part occupying the low humidity region using molybdenum, and then applying powdered tungsten to the outer periphery of this molded body by sintering and forming. Easily manufactured.

As described above, the short arc firing according to the present invention is as follows.
It is characterized by having an anode made of molybdenum in the region where the temperature during operation does not exceed 2000 t:' and made of tungsten in the region exceeding zoooc, so it has torsional vibration resistance, For example, it is highly practical as a fishing rod.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing an example of the configuration of a Nyoto arc discharge lamp, Fig. 2 is a cross-sectional view for debrightening showing a conventional I field pole constituting a Nyoto arc discharge lamp, and Fig. 3 is a cross-sectional view showing a conventional I field pole constituting a Nyoto arc discharge lamp. It is an explanatory cross-sectional view showing an anode which constitutes a short arc discharge illusion. 1... Enclosure 11... Spherical part 12.18... Cylindrical part 14.15... Small diameter part 21
．． 22...Lead rod 8...Anode 31...Lead h insertion hole L...Low temperature range H...High temperature range 4...
Cathode 51.52...Representative agent Patent attorney Masahiko Oi (1. From the procedural amendment) December 6, 1980 Kazuo Wakasugi, Commissioner of the Japan Patent Office 1 Indication of the case 1988 Patent fragment 186872 No. 2 Name of the invention Short arc lighting 3. Relationship with the case of the person making the amendment Patent applicant 4, agent 5, date of amendment order 6. Number of inventions increased by amendment (1) As shown in the attached sheet ( 2) (2) ■ Page 4 of the specification letter, between lines 4 and 6, is written as follows: ``J stop〇''The feature is that the temperature during operation is 2000℃.
At least a part of the area not exceeding 11 iV is made of molybdenum, and the part other than the part made of molybdenum is made of tungsten.'' ■ Add item 1 next to line 20 on page 6 of the same page ``Figure 4. 10 shows an anode in another embodiment of the present invention. In this example, the outer peripheral part (including the high temperature range) is made of tungsten, and the other parts are made of molybdenum. With such a structure, f''l can more reliably prevent the evaporation of molybdenum than in the embodiments in which molybdenum is evaporated. Go ■ Page 7, lines 6 to 8, n4+ are corrected as follows. ``■ Burning is made of molybdenum at least in part in the region where the temperature does not exceed 2000℃ at 4 hours (TQi is made up of tungsten) (3) Correct line 17 of page 7 of the specification as follows. The anode of another embodiment of the release [J is shown in Figure 1. Figure 4 of the drawings is supplemented. (Attachment 2, Claim 1) Operation fi ['I region - where the temperature at the time does not exceed 2000°C - is characterized by comprising an anode made of molybdenum at least in part and made of tungsten other than the part made of molybdenum. A short arc Houki Gen.

Claims (1)

[Claims] l) A short arc discharge lamp characterized by comprising an anode made of molybdenum/vc in the region where the temperature during operation does not exceed 2000°C and made of tungsten in the region where the temperature exceeds 2000°C.