JPH10284000A - High pressure discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance optical characteristics and pressure resistance performance by eliminating a chip portion form the bulb portion of a bulb. SOLUTION: A bulb 2 has a hollow bulb portion 3, a pair of sealed portions 7, 8 formed by sealing of tubes 5, 6 communicated to both ends of the bulb portion 3, and a chip portion 11 formed on one sealed portion 7. A pair of electrodes 9, 10 opposed to each other inside the bulb portion 3 are sealed to the pair of sealed portions 7, 8. A discharge medium containing a halide, a rare gas, and mercury is sealed inside the bulb portion 3. After the inside of the bulb portion 3 is evacuated and the discharge medium sealed through an exhaust pipe communicated to one tube 5, one tube 5 is sealed and the exhaust tube is removed to form the chip portion 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high-pressure discharge lamp in which a discharge medium containing a halide, a rare gas and mercury is sealed in a bulb portion.

[0002]

2. Description of the Related Art Conventionally, as a light source for a liquid crystal projector, an overhead projector, or the like, a metal halald in which a metal halide containing at least one of dysprosium (Dy) and neodymium (Nb) in a short arc form is enclosed as a discharge medium. Lamps are used. In this metal Harald lamp, a substantially spherical or spheroidal bulb portion is formed in the bulb, and a pair of electrodes are sealed to a pair of sealing portions at both ends of the bulb portion so as to face each other. Is filled with a discharge medium containing a halide, a rare gas and mercury.

In a high-pressure discharge lamp such as a metal Harald lamp, a chip portion is formed on a peripheral surface of a bulb portion after removing an exhaust pipe which is always required in a manufacturing process.

That is, in the manufacturing process of a high-pressure discharge lamp, a bulb material is used in which a base tube is connected to both ends of a hollow bulb portion and an exhaust pipe is connected to a peripheral surface of the bulb portion. After the electrodes are inserted, each of the element tubes is sealed, the electrodes are sealed in the sealed portions, the inside of the bulb portion is evacuated through the exhaust pipe, and the discharge medium is sealed in the bulb portion. The exhaust pipe is later removed, and the tip is formed after the exhaust pipe is removed.

[0005]

However, in the conventional high-pressure discharge lamp, a chip formed in the manufacturing process is formed on the peripheral surface of the bulb, so that the light generated by the discharge in the bulb is generated by the tip of the bulb. When passing through the lens, light scattering occurs due to the lens function of the chip part, and the tip part protruding outward from the bulb part becomes the coldest part, and extra halide that does not evaporate inside the bulb part There is a problem that optical properties such as accumulation of mercury and reduction of luminous flux are accumulated.

There is another problem that the wall thickness of the tube wall must be increased in order to ensure the pressure resistance of the tip portion.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a high-pressure discharge lamp in which a chip portion is eliminated from a bulb portion of a bulb to improve optical characteristics and pressure resistance. I do.

[0008]

According to a first aspect of the present invention, there is provided a high-pressure discharge lamp comprising: a hollow bulb portion; a pair of sealing portions formed by sealing a base tube communicating with both ends of the bulb portion; A bulb having a tip part formed in the part; a pair of electrodes respectively sealed to a pair of sealing parts and facing each other in the bulb part; and containing a halide, a rare gas and mercury sealed in the bulb part. And a discharge medium.

Since the chip portion is formed in the sealing portion,
In other words, after exhausting the inside of the bulb portion and filling the discharge medium through the exhaust pipe connected to the raw pipe, the raw pipe is sealed and the exhaust pipe is removed to form a chip portion. Eliminating the tip portion from the bulb portion to improve the optical characteristics and the pressure resistance performance.

According to a second aspect of the present invention, there is provided a high-pressure discharge lamp comprising a hollow bulb portion, a pair of sealing portions formed by sealing a raw tube communicating with both ends of the bulb portion, and an exhaust pipe connecting portion of the raw tube. A bulb having a cut portion formed by cutting off the distal end side thereof; a pair of electrodes respectively sealed to a pair of sealing portions and facing each other in the bulb portion; a halide and a rare gas sealed in the bulb portion And a discharge medium containing mercury.

Since the cut end is formed by cutting off the distal end of the base tube of the valve including the exhaust pipe connection portion, that is, exhausting the inside of the valve portion and filling the discharge medium through the exhaust pipe connected to the base tube. After that, the base tube is sealed and the tip side including the exhaust pipe connection part of the base tube is removed, so that the tip part is eliminated from the valve part of the valve, optical characteristics are improved and pressure resistance is improved. Improve.

A high pressure discharge lamp according to a third aspect of the present invention is the high pressure discharge lamp according to the first or the second aspect, wherein a peripheral surface centered on both ends of the bulb portion is formed in an annular cross section. There is no tip in the valve part of
The optical characteristics are improved and the pressure resistance is improved.

In each of the claims, the bulb is made of quartz glass, translucent ceramics and alumina,
Includes those formed of a material such as a single crystal such as YAG. The valve portion includes a substantially spherical shape or a spheroidal shape.

The electrodes include those formed of a tungsten material.

As the discharge medium, dysprosium (D
y) and a metal halide such as neodymium (Nb) as a main component, and further contains thallium (Tl) and tin (Sn) as subcomponents. (Br) with noble gas and mercury.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the high-pressure discharge lamp according to the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of a lighting apparatus using a high-pressure discharge lamp, and FIG. 2 shows steps (a) to (d) of manufacturing a high-pressure discharge lamp.
FIG. 3 is an explanatory view for explaining a manufacturing process of the high-pressure discharge lamp following FIG. 2 in the order of (e) to (g), and FIG.
FIG. 5 is an explanatory view for explaining the manufacturing process of the high-pressure discharge lamp following FIG. 3 in the order of (h) to (k). FIG. 5 is an explanatory diagram for explaining the manufacturing process of the high-pressure discharge lamp following FIG. 4 in the order of (l) to (p). FIG.

In FIG. 1, reference numeral 1 denotes a high-pressure discharge lamp such as a metal Harald lamp. The high-pressure discharge lamp 1 has a bulb 2 made of, for example, quartz glass, and has an outer diameter of about 15.5 mm at the center of the bulb 2. Is formed, a discharge space 4 is formed inside the bulb portion 3, and the bulb portion 3 is provided at both ends of the bulb portion 3.
Are sealed to form a pair of sealing portions 7 and 8, and the sealing portions 7 and 8 are respectively sealed with an anode 9 and a cathode 10 as a pair of electrodes. ing.

A tip portion 11 is formed on one of the base tubes 5 of the bulb 2. The tip portion 11 is an exhaust pipe at first, and is formed to exhaust the inside of the valve section 3 through the exhaust pipe and to fill the discharge medium into the valve section 3. Formed by removal.

The anode 9 and the cathode 10 are connected to the bulb 3
And sealed inside each other. The anode 9 is
For example, it is formed by winding a tungsten wire around a tungsten bar. The cathode 10 is formed of, for example, a tungsten bar.

Metal foils 12 and 13 made of, for example, tungsten and having a thickness of 30 μm and a width of 3 mm are respectively sealed to the sealing portions 7 and 8 of the bulb 2. The anode 9 and the cathode 10 are electrically connected to each other, and lead wires 14 and 15 protruding outside the bulb 2 are electrically connected to opposing outer ends of the metal foils 12 and 13.

In the valve section 3, a halide,
A discharge medium containing a rare gas and mercury is sealed. Examples of the discharge medium include luminescent metals such as dysprosium (Dy), neodymium (Nb), thallium (Tl) and tin (Sn), iodine (I) and bromine (B) as halogens.
r), including noble gases and mercury.

The high-pressure discharge lamp 1 is configured as a lighting device by combining a reflecting mirror 21 and a lighting device (not shown). This reflector
Reference numeral 21 is made of, for example, glass, and has a reflecting mirror main body 22 and a cylindrical neck portion 23 at the top of the reflecting mirror main body 22, and has an inner surface of the reflecting mirror main body 22 that reflects visible light and transmits infrared light. A reflection film (not shown) is formed, and a through hole (not shown) is formed in a part. In the neck part 23 of the reflector 21,
A base 24 arranged on the side of the sealing section 7 on the side of the anode 9 of the high-pressure discharge lamp 1 is fixed via a base cement or the like.

A lead wire 26 is connected to the lead wire 15 on the cathode 10 side of the high-pressure discharge lamp 1, and this lead wire 26 is guided to the back side of the reflecting mirror 21 through a through hole of the reflecting mirror 21.

This illumination device can be used as a light source of an image projection device such as a liquid crystal projector or an overhead projector.

Next, the manufacturing process of the high-pressure discharge lamp 1 will be described in the order of FIGS. 2 to 5 (a) to (p). The manufacturing process includes a valve material molding process shown in FIG. 2A, an end sealing process shown in FIGS. 2B-2D, a primary sealing process shown in FIGS. 3E-3G, and FIG. h) to the exhaust process of FIG. 4 (i), FIG. 4 (j)
4 (k), the secondary sealing step shown in FIGS. 5 (l) to 5 (n), and the cutting step shown in FIGS. 5 (o) to 5 (p).

As shown in FIG. 2A, a valve material 31 of the valve 2 is used. In this valve material 31, pipe-shaped raw pipes 5 and 6 are respectively connected to both ends of a hollow valve section 3, and one raw pipe 5 is formed longer than the other raw pipe 6, and a pipe is provided at an intermediate portion. An exhaust pipe 32 composed of a small thin tube is communicated.

As shown in FIG. 2 (b), in the end sealing step, an electrode in which an anode 9, a metal foil 12, a lead wire and a metal foil 33 for temporary fixing are formed in series in a valve material 31. With the mount 34 inserted, the valve blank 31 and the electrode mount 34 are mounted on the valve chuck 35. The valve blank 31 holds the raw tube 6 side on a valve chuck 35, and the electrode mount 34 holds the anode 9 side on an electrode chuck 36 built in the valve chuck 35.

Then, the electrode mount 34 is positioned at an appropriate position in the valve material 31, and a part of the lead wire 14 of the raw tube 5 and the end seal portion where the metal foil 33 is located by the burner 37.
Heat and melt 31a.

As shown in FIG. 2C, the end sealing portion 31a of the heated and melted raw tube 5 is temporarily sealed by a sealing device 38 to form a temporary sealing portion 39. A part of the lead wire 14 and the metal foil 33 are temporarily sealed to 39.

As shown in FIG. 2D, after the electrode mount 34 is temporarily fixed to the valve material 31 via the temporary sealing portion 39, the valve material 31 and the electrode mount 34 are removed from the valve chuck 35.

As shown in FIG. 3 (e), in the primary sealing step, the end seal portion 31a of the raw tube 5 of the valve material 31 is mounted and held on the valve chuck 35. Cathode 10, metal foil
An electrode mount 40 in which 13 and the lead 15 are connected in series is held on the electrode chuck 41 via the lead 15. The electrode mount 40 is inserted into the bulb material 31 from below the raw tube 6.

Then, the electrode mount 40 is positioned at an appropriate position in the valve material 31, and the portion of the raw tube 6 is heated and melted by the burner 37.

As shown in FIG. 3 (f), the heat-fused raw tube 6 is sealed by a sealing device 38 to form a sealing portion 8. The sealing portion 8 includes a base of the cathode 10 and a metal. The foil 13 and a part of the lead wire 15 are sealed.

As shown in FIG. 3 (g), after the electrode mound 40 is sealed to the valve material 31 via the sealing portion 8, the electrode mount 40 is removed from the electrode chuck 41 and the valve material 31 is removed from the valve chuck 35. Remove from

In the state after the primary sealing step, the raw tubes 5 and 6 at both ends of the valve material 31 are temporarily sealed and sealed.
The inside of the valve part 3 is partially sealed with a pipe 5 and an exhaust pipe.
It is communicated to the outside through 32.

As shown in FIG. 4 (h), when the exhaust process starts, a predetermined amount of mercury and chemicals are introduced into the valve section 3 through the exhaust pipe 32.

As shown in FIG. 4 (i), the exhaust pipe 32 is mounted on the exhaust head 42, and the exhaust head 42 exhausts the pipe of the valve material 31 communicating with the exhaust pipe 32 through the exhaust pipe 32. Then, a discharge medium having a predetermined pressure is injected.

As shown in FIG. 4 (j), when the chip process is started, the intermediate portion of the exhaust pipe 32 is chipped by the burner 43. That is, the exhaust pipe 32 is heated and melted, sealed, and the exhaust pipe 32 is divided into two parts.

As shown in FIG. 4K, after the evacuation step, the inside of the valve material 31 is hermetically sealed.

As shown in FIG. 5 (l), in the secondary sealing step, the end seal portion 31a of the raw tube 5 of the valve material 31 is mounted and held on the valve chuck 35. The pipe 6 of the valve material 31 and the valve section 3 are immersed in a coolant 45 such as liquid nitrogen stored in a container 44, and a part where the metal foil 12 of the pipe 5 is located by the burner 37 while cooling them. Is heated and melted.

As shown in FIG. 5 (m), the heat-fused raw tube 5 is sealed by a sealing device 38 to form a sealing portion 7, and the base of the anode 9 and the metal The foil 12 and a part of the lead wire 14 are sealed.

As shown in FIG. 5 (n), the valve blank 31 is removed from the valve chuck 35.

In the state after the secondary sealing, the valve 3
The element tubes 5 and 6 communicating with both ends of the element 3 are sealed by sealing parts 7 and 8 respectively, and the anode 9 and the cathode 10 sealed at predetermined positions in the bulb part 3 face each other.

As shown in FIG. 5 (o), when the cutting process is started, the end seal portion 31a of the valve material 31 is cut.

As shown in FIG. 5 (p), the tip of the raw tube 5 is cut, and the exhaust pipe 32 is chipped by the burner 46. That is, the exhaust pipe 32 is heated and melted to form the tip portion 11.

Thus, the high-pressure discharge lamp 1 is manufactured.

Therefore, one sealing portion 7 of the valve portion 3
Since the tip portion 11 is formed in one of the raw tubes 5, that is, after the exhaust in the bulb portion 3 and the filling of the discharge medium are performed through the exhaust pipe 32 communicated with the one of the raw tubes 5. However, since one of the element pipes 5 is sealed and the exhaust pipe 32 is removed to form the chip section 11, the chip section 11 can be eliminated from the valve section 3, thereby improving the optical characteristics and improving the pressure resistance. Can be improved.

The exhaust pipe 32 of one of the raw pipes 5 of the valve 2
Even if the distal end side including the connecting portion is cut off to form a cut portion, that is, after the exhaust in the bulb portion 3 and the sealing of the discharge medium are performed through the exhaust pipe 32 communicated with one of the raw tubes 5, Even if one of the base tubes 5 is sealed and the distal end side of the base tube 5 including the connection portion of the exhaust pipe 32 is removed, the tip portion 11 can be eliminated from the bulb portion 3 and the optical characteristics can be improved. It is possible to improve the pressure resistance as well as to improve the performance.

In any case, since the peripheral surface of the bulb portion 3 centered on both ends is formed in an annular cross section,
Since the bulb portion 3 does not have the tip portion 11, the optical characteristics are improved and the pressure resistance is improved.

[0051]

According to the high pressure discharge lamp of the first aspect, since the chip portion is formed in the sealing portion, that is, the exhaust in the bulb portion and the filling of the discharge medium through the exhaust pipe communicating with the raw tube. Is performed, the base tube is sealed, and the exhaust pipe is removed to form a chip portion. Therefore, the chip portion can be eliminated from the valve portion of the valve, improving the optical characteristics and improving the pressure resistance. Can be improved.

According to the high pressure discharge lamp of the second aspect,
Since the cut end is formed by cutting off the distal end including the exhaust pipe connection portion of the raw pipe of the valve, that is, after the exhaust inside the valve section and the filling of the discharge medium are performed through the exhaust pipe connected to the raw pipe. Because the base tube is sealed and the front end side including the exhaust pipe connection part of the base tube is removed, the tip portion can be eliminated from the valve portion of the valve, improving the optical characteristics and improving the pressure resistance performance. Can be improved.

According to the high pressure discharge lamp of the third aspect,
In addition to the effect of the high-pressure discharge lamp according to claim 1 or 2, since the peripheral surface centered on both ends of the bulb portion is formed in an annular cross section, the bulb portion of the bulb has no tip portion, and the bulb portion has no tip. The characteristics are improved and the pressure resistance is improved.

[Brief description of the drawings]

FIG. 1 is a side view using a high-pressure discharge lamp showing an embodiment of the present invention.

FIG. 2 is an explanatory view for explaining a manufacturing process of the high pressure discharge lamp in the order of (a) to (d).

FIG. 3 shows a manufacturing process of the high-pressure discharge lamp following FIG.
It is explanatory drawing explaining in order of (e)-(g).

FIG. 4 shows a manufacturing process of the high-pressure discharge lamp following FIG.
It is explanatory drawing explaining in order of (h)-(k).

FIG. 5 shows a manufacturing process of the high-pressure discharge lamp following FIG.
It is explanatory drawing explaining in order of (l)-(p).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-pressure discharge lamp 2 Bulb 3 Bulb part 5, 6 Raw tube 7, 8 Sealing part 9 Anode as electrode 10 Cathode as electrode 11 Chip part

Claims (3)

[Claims] A valve having a hollow valve portion, a pair of sealing portions formed by sealing element pipes communicating with both ends of the valve portion, and a tip portion formed in the sealing portion; A pair of electrodes respectively sealed to the sealing portion and opposed to each other in the bulb portion; and a discharge medium containing a halide, a rare gas and mercury sealed in the bulb portion. High pressure discharge lamp. 2. A hollow valve portion, a pair of sealing portions formed by sealing element pipes communicating with both ends of the valve section, and a distal end side including an exhaust pipe connection portion of the element pipe are cut off. A pair of electrodes respectively sealed to the pair of sealing portions and facing each other in the bulb portion; and a discharge medium containing a halide, a rare gas and mercury sealed in the bulb portion; A high-pressure discharge lamp comprising: 3. The valve device according to claim 1, wherein a peripheral surface centered on both ends of the valve portion has an annular cross section.
Or the high-pressure discharge lamp according to 2.