WO2010001530A1

WO2010001530A1 - Hid lamp

Info

Publication number: WO2010001530A1
Application number: PCT/JP2009/002519
Authority: WO
Inventors: 加藤育宏
Original assignee: Kato Yasuhiro
Priority date: 2008-07-03
Filing date: 2009-06-04
Publication date: 2010-01-07
Also published as: JP4338762B1; JP2010015800A

Abstract

The issue is to provide an HID lamp that can maintain a stable discharge state. A coil (12) is wound around the outer circumferential surfaces of intermediate parts (7b, 8b), and the diameter of the coil (12) is 0.13 mm, for example. Consequently, when wound with the coil (12), the diameter (φ2) of intermediate parts (7b, 8b) will be 0.66 mm, which is equal to plug bodies (7a, 8a). A coil (13) is also wound around tip parts (7c, 8c). The coil (13) has a diameter that is smaller than the coil (12), and is 0.06 mm, for example. Consequently, when wound with the coil (13), the diameter (φ1) of the tip parts (7c, 8c) of the electrodes, including the diameter of coil (13), will be 0.51 mm. Thus, by using a small-diameter coil (13), thermoelectrons are discharged preferentially from the tip parts (7c, 8c), which have a smaller diameter (φ1), rather than from the intermediate parts (7b, 8b), which have a larger diameter, and the transition to arc discharge is easier.

Description

HID lamp

The present invention relates to an HID lamp that exhibits easy startability, high efficiency, and high color rendering among discharge lamps.

A general structure of an HID lamp is a structure in which electrodes are provided at both ends of a discharge vessel so as to hold the electrodes in an airtight manner, and power is supplied to the electrodes exposed from the sealing portion from the outside via a molybdenum foil or the like. Presents.

In general, silica and alumina ceramics are used as the material for the discharge vessel. In addition to nitrogen, argon, krypton, xenon, mercury, and sodium halide, a high color rendering property is expressed in the discharge vessel as a rare earth gas. Metal halide lamps filled with rare earth metal halogen compounds such as dysprosium (Dy), scandium (Sc), neodymium (Nd), europium (Eu), holmium (Ho), thulium (Tm), ytterbium (Yb) It has been known.

In addition, the electrode plug which is sealed with frit glass and whose one end is exposed to the outside from the sealed portion is electrically conductive including niobium (Nb), its alloy, or metal whose thermal behavior is similar to that of the discharge vessel material. Ceramics and glass, and the tip part facing the discharge space from the intermediate part held inside the sealing part is made of tungsten (W) or molybdenum (Mo) which is excellent in heat resistance and chemically stable against metal halides. Are welded to form one electrode.

In HID lamps, the electrode becomes extremely hot during discharge, and the material constituting the electrode is unilaterally scattered, ignoring the halogen cycle, and blackening that adheres to the inner wall (coldest part) of the arc tube A phenomenon may occur. In order to prevent this, as disclosed in Patent Documents 1 to 3, a coil of tungsten (W) or molybdenum (Mo) is wound around the electrode, and the heat generated in the electrode is dissipated from the coil and cooled. Has been taken.

In Patent Document 1, a rear end portion is held from an intermediate portion of a tungsten (W) electrode inside a sealing portion provided at both ends of an arc tube, and a tungsten (W) coil is outside the portion. A structure in which is wound is disclosed.

In Patent Document 2 and Patent Document 3, not only electrodes held inside sealing portions provided at both ends of the arc tube but also tungsten (W) or molybdenum at the electrode tip facing the discharge space of the arc tube. A structure in which a coil of (Mo) is wound is disclosed.

JP 2000-268773 A WO2005 / 196347 JP 2008-10272 A

In Patent Document 1, since the coil is not wound around the tip of the electrode, the tip of the electrode is easily melted.

In the electrode structure disclosed in Patent Document 2, since the coil is wound not only on the intermediate portion held inside the sealing portion of the electrode but also on the tip portion of the electrode, the heat dissipation effect at the tip portion of the electrode is also increased. Yes. However, since the diameter φ1 of the tip of the electrode is equal to the diameter φ2 of the intermediate portion as shown in FIG. 6 with the coil wound, the discharge is likely to occur from the intermediate portion of the electrode, and a stable discharge can be obtained at the start. hard.

Further, if the winding region of the coil wound around the intermediate part is retracted from the discharge space, the discharge from the intermediate part becomes difficult to occur, but a gap is formed between the electrode and the electrode insertion hole of the discharge tube. The metal halide that is solid and liquid stagnates in the gap, and the metal halide that is stagnated and blocked has a disadvantage that it does not contribute to lighting of the lamp even if the electrode temperature rises due to lighting.

In the electrode structure disclosed in Patent Document 3, since the electrode tip portion is thinner than the electrode intermediate portion, discharge tends to concentrate on the tip portion. However, since the tip of the electrode is tungsten (W) and the intermediate part of the electrode is molybdenum (Mo) and these are welded, the misalignment between the pair of electrodes as shown in FIGS. 7 (a) and 7 (b) Will be forced. When misalignment occurs, the discharge fluctuates, the arc becomes unstable, and the lamp life is shortened.

In order to solve the above problems, an HID lamp according to the present invention is a HID lamp in which sealing portions are provided at both ends of a ceramic discharge vessel, and electrodes are held at these sealing portions via frit glass. One end part is composed of a plug body exposed from the sealing part, an intermediate part arranged inside the sealing part, and a tip part facing the discharge space. The plug body is made of niobium (Nb), niobium alloy or metal. The intermediate portion and the tip portion are made of one continuous and the same diameter tungsten (W) or molybdenum (Mo) rod or coil wire, and the outside of the intermediate portion is A coil made of tungsten (W) or molybdenum (Mo) is wound, and tungsten (W) or molybdenum having the same diameter as that of the coil wound around the intermediate portion is outside the tip portion. Buden (Mo) steel coil is wound and a coil wound around said distal portion is a single turn coil wound around the intermediate portion is a double-wrap.

In the HID lamp according to the present invention, a coil is wound around the intermediate portion and the tip portion of the electrode to enhance the cooling effect, and at this time, the diameter of the tip portion of the electrode including the diameter of the coil is made smaller than the diameter of the intermediate portion. Therefore, thermionic emission always occurs from the tip of the electrode and is difficult to be emitted from the middle of the electrode, so that stable arc discharge can be expected.

Also, since the middle part and the tip part of the electrode consist of one continuous bar and there is no weld, there will be no misalignment. Therefore, a stable discharge state can always be maintained from the start, and a significant improvement in life can be expected.

In particular, the arc discharge at start-up becomes extremely stable by reducing the diameter of the tip of one rod by cutting or drawing and winding a small-diameter coil around this portion.

Overall view of lighting fixtures incorporating HID lamps Sectional view of an HID lamp according to the present invention Enlarged view of electrode Enlarged view of electrodes according to another embodiment Enlarged view of electrodes according to another embodiment Sectional view of the main part of a conventional HID lamp (A) And (b) is the figure explaining the misalignment of the conventional HID lamp.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is a general view of a luminaire incorporating the HID lamp according to the present invention, FIG. 2 is a sectional view of the HID lamp according to the present invention, FIG. 5 is an enlarged view of the electrode according to the present invention, FIG. 4 is an enlarged view of an electrode according to a reference example.

The lighting apparatus shown in FIG. 1 has a triple tube structure that does not require a front glass, and an inner tube 2 is arranged in the outer tube 1, and the HID lamp 3 according to the present invention is incorporated in the inner tube 2. 4,

conductors

5 and 6 are connected to

electrodes

7 and 8 of the HID lamp 3, respectively.

In this embodiment, the

electrodes

7 and 8 are constituted by

plug bodies

7a and 8a,

intermediate portions

7b and 8b, and

tip portions

7c and 8c, respectively. Further, sealing

portions

9 and 9 are formed at both ends of the HID lamp 3. Holes 9a and 9a of the ceramic tube through which the

electrodes

7 and 8 are inserted are formed in the sealing

portions

9 and 9 in the coaxial direction. Here, the diameters of the holes 9a and 9a are set to 0.7 mm, for example, and these holes 9a and 9a are simultaneously processed by a single needle-shaped polishing jig. For this reason, the holes 9a and 9a of the sealing

portions

9 and 9 are not displaced from each other, and the complete coaxiality exists in the lamp.

The

plugs

7a and 8a are exposed at sealing portions 9 provided at both ends of the HID lamp 3 at one end and are connected to the

conductors

5 and 6. The

plugs

7a and 8a are made of niobium (Nb), niobium alloy, or conductive ceramic glass that exhibits a behavior similar to the thermal behavior of the ceramics constituting the sealing portion 9, and its diameter is, for example, 0.66 mm. .

The gap between the outer peripheral surface of the

plug bodies

7a, 8a and the inner peripheral surface of the sealing portion 9 is filled with the frit glass 12 to maintain airtightness. In order to adjust the insertion positions of the

electrodes

7 and 8 into the discharge space 10 of the HID lamp 3, stoppers 11 are mounted on the outer peripheral surfaces of the

plug bodies

7a and 8a.
In the embodiment of the present invention shown in FIG. 5, the

coils

12 and 13 have the same diameter and a small diameter (φ3), and the coils 12 are wound twice around the

intermediate portions

7b and 8b. A coil 13 is wound around the

portions

7c and 8c in a single layer. As a result, even if the diameters of the electrodes are the same at the

intermediate portions

7b and 8b and the

tip portions

7c and 8c, φ2> φ1 when the coil is wound, and thermoelectrons are preferentially emitted from the

tip portions

7c and 8c. .

On the other hand, the

intermediate portions

7b and 8b and the

tip portions

7c and 8c of the reference example shown in FIG. 3 are composed of continuous coaxial rods / wires (wires) made of tungsten (W) or molybdenum (Mo), and their diameters are as a whole. It is the same. The

plugs

7a, 8a and the

intermediate portions

7b, 8b are preliminarily engaged with each other so that the axes are aligned as much as possible.

A coil 12 made of tungsten (W) or molybdenum (Mo) is wound around the outer peripheral surfaces of the

intermediate portions

7b and 8b for cooling. The diameter of the coil 12 is 0.13 mm, for example. As a result, in the state where the coil 12 is wound, the diameter (φ2) of the

intermediate portions

7b and 8b becomes 0.66 mm which is equal to the

plug bodies

7a and 8a.

Further, a cooling coil 13 made of tungsten (W) or molybdenum (Mo) is also wound around the

tip portions

7c and 8c. The coil 13 has a diameter smaller than that of the coil 12, for example, 0.06 mm. As a result, in the state where the coil 13 is wound, the diameter (φ1) of the

electrode tip portions

7c and 8c including the diameter of the coil 13 is 0.51 mm.

That is, in the present invention, φ2> φ1. Here, the diameter of the coil 13 is φ3, the diameter of the

electrode tip portions

7c and 8c when the coil 13 is not wound is φ4, the diameter of the coil 12 is φ5, and the intermediate portion 7b when the coil 12 is not wound. If the diameter of 8b is φ6, then φ2 = 2φ5 + φ6> 2φ3 + φ4− = φ1. In the embodiment shown in FIG. 3, φ4 = φ6.

Thus, by winding the coil 13 having a small diameter, the thermoelectrons are surely emitted not from the

intermediate portions

7b and 8b having a large diameter but from the

tip portions

7c and 8c having a small diameter (φ1), thereby smoothly arcing. Transition to discharge.

FIG. 4 is a view similar to FIG. 3 showing another embodiment. In this embodiment, the diameters φ6 of the

tip portions

7c, 8c of the

electrodes

7, 8 are ground and thinned, and the tip portions 7c, A coil 13 having a small diameter is wound around 8c. Therefore, even in this embodiment, the diameters (φ1) of the

tip portions

7c, 8c including the coil 13 are smaller than the diameters (φ2) of the

intermediate portions

7b, 8b including the coil 12.

Here, when the thinned

portions

7c and 8c of FIG. 4 are prepared as separate bodies and welded to the

intermediate portions

7b and 8b, as described in the prior art section, misalignment is caused during welding. Forced. Therefore, it is practically desirable that the

intermediate portions

7b and 8b and the

tip portions

7c and 8c are cut out from an integrated rod / wire (wire) or drawn.

According to the present invention, since the holes 9a and 9a of the sealing

portions

9 and 9 are simultaneously processed with one needle-like polishing jig, the coaxial accuracy is extremely high. The centers of the axes of the

electrodes

7 and 8 inserted into the holes 9a and 9a of the ceramic tube are determined by the

intermediate portions

7b and 8b. That is, since the

plug bodies

7a, 8a and the

intermediate portions

7b, 8b are welded, the shafts of the

plug bodies

7a, 8a and the axes of the

intermediate portions

7b, 8b may be slightly shifted at the welded portion. However, there is a gap between the outer peripheral surface of the

plugs

7a, 8a and the inner peripheral surface of the holes 9a, 9a, and the gap is sealed with the frit glass 10. Even if this occurs, the thickness of the frit glass 10 changes, so that the deviation is almost absorbed and the axes of the

electrodes

7 and 8 coincide.

DESCRIPTION OF SYMBOLS 1 ... Outer pipe | tube, 2 ... Inner pipe | tube, 3 ... HID, 4 ... Base, 5, 6 ... Conductor, 7, 8 ... Electrode, 7a, 8a ... Plug body, 7b, 8b ... Middle part of electrode, 7c, 8c DESCRIPTION OF SYMBOLS ... Electrode tip part, 9 ... Sealing part, 9a ... Hole of sealing part, 10 ... Discharge space of lamp, 11 ... Stopper, 12 ... Coil wound around electrode intermediate part, 13 ... Winding around electrode tip part Coil, g ... frit glass, φ1 ... diameter of electrode tip including coil, φ2 ... diameter of electrode intermediate part including coil, φ3 ... diameter of coil wound around electrode tip, φ4 ... electrode tip , Φ5: diameter of the coil wound around the electrode intermediate portion, φ6: diameter of the electrode intermediate portion.

Claims

In an HID lamp in which sealing portions are provided at both ends of a ceramic discharge vessel and the electrodes are held at these sealing portions via frit glass, the electrode has a plug body with one end exposed from the sealing portion, and the sealing member. An intermediate portion disposed inside the stop portion and a tip portion facing the discharge space, the plug body is made of conductive ceramic glass containing niobium (Nb), niobium alloy or metal, and the intermediate portion and the tip portion are It consists of one continuous and the same diameter tungsten (W) or molybdenum (Mo) rod or coil wire, and a coil made of tungsten (W) or molybdenum (Mo) is wound outside the intermediate portion. In addition, a coil made of tungsten (W) or molybdenum (Mo) having the same diameter as that of the coil wound around the intermediate part is wound outside the tip part, and the tip Wound coils wound is a single-turn coil wound around the intermediate portion HID lamp, characterized in that there is a double-wrap.
In an HID lamp in which sealing portions are provided at both ends of a ceramic discharge vessel, and the electrodes are held at these sealing portions via frit glass, the electrode has a plug whose one end is exposed from the sealing portion; An intermediate part disposed in the stop part and a tip part facing the discharge space, the plug body is made of conductive ceramic glass containing niobium (Nb), niobium alloy or metal, and the intermediate part and tip part are 1 It consists of a continuous tungsten (W) or molybdenum (Mo) rod, and a coil made of tungsten (W) or molybdenum (Mo) is wound around the outside of the intermediate portion. A coil made of tungsten (W) or molybdenum (Mo) having a diameter smaller than that of the intermediate portion by machining and having a diameter smaller than that of the coil wound around the intermediate portion. HID lamps, characterized in that There has been wound.