JP2000048767A - Electrode for discharge lamp, and discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure three characteristics, i.e., the standard of the current value, the standard of the preheat characteristic and the service life of a rated lamp in an electrode of a triple coil of a discharge lamp for high-frequency lighting. SOLUTION: An electrode 21 for a discharge lamp is constituted by adhering an electron radiation material to a filament. In the filament, a tungsten wire is wound three times to form a third coil part 33. The electrode current value characteristic can be improved by setting the resistance value between clamped parts 36, 36 to be 2.1±0.3 Ω. The preheat characteristic can be improved by setting the weight between the clamped parts 36, 36 of the filament to be 9.0 mg or under. The temperature characteristic of the electrode can be improved by setting a clearance A3 between coils of the third coil part 33 to be 0.14 mm or under. The electron radiation material of sufficient quantity can be adhered to the filament and the service life of a rated lamp can be ensured by setting a clearance between coils of a second coil part 32 located on an outer circumferential part of the third coil part 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp electrode having a filament coated with an electron emitting material, and a discharge lamp provided with the discharge lamp electrode.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. 4-284345.
JP-A-8-77966 discloses a fluorescent lamp using an electrode formed by attaching an emitter, that is, an electron-emitting substance, to a filament which is a triple coil in which a tungsten wire is wound three times. It has been known. For example, regarding the electrode characteristics of FHF32 defined by JIS, which is a fluorescent lamp dedicated to high-frequency lighting,
The regulation of the current value when a constant voltage is applied and the preheating characteristics are specified, and it is required to secure the amount of the deposited emitter capable of satisfying the rated lamp life in both the rated lighting and the high output lighting.

[0003]

In the above-mentioned conventional configuration,
Regarding the electrode characteristics of the high-frequency dedicated lamp, the three items of current value regulation at the time of applying a constant voltage, preheating characteristics, and rated lamp life in both the rated lighting and high-power lighting conditions, that is, the emitter adhesion amount, must be satisfied simultaneously. Have problems that are difficult.

The present invention has been made in view of the above points, and simultaneously improves the current value regulation at the time of applying a constant voltage, the preheating characteristic, and the rated lamp life in both the rated lighting and the high output lighting. It is an object of the present invention to provide a discharge lamp electrode and a discharge lamp that can be used.

[0005]

According to a first aspect of the present invention, there is provided a discharge lamp electrode including a pair of leg portions each having a clamped portion held by an electrode clamp, a second coil portion wound twice. A filament having a third coil portion wound three times by further winding a second coil portion between the leg portions; and an electron emitting substance attached to the filament; Is less than 2.1 ±
0.3Ω, tungsten wire weight between clamped parts of filament is 9.0mg or less, weight between clamped parts of electron emitting material is 2.0mg or more and 4.0mg or less, coils forming third coil part Is 0.1 mm
4 mm or less, the distance between the coils constituting the second coil portion located on the outer peripheral portion of the third coil portion is 0.1 ±
0.06 mm.

[0006] In this configuration, more than 20 degrees Celsius
1. The resistance value between the clamped parts in the range of 5 degrees or less
By setting the resistance to 1 ± 0.3Ω, the electrode current value characteristics are improved, and by setting the weight of the tungsten wire between the clamped portions of the filament to 9.0 mg or less, the preheating characteristics are improved and the third coil portion is formed. By setting the distance between the coils to 0.14 mm or less, the heat diffusion during preheating is reduced, the temperature characteristics of the electrodes are improved, and the coils forming the second coil located at the outer periphery of the third coil are connected to each other. By setting the separation dimension to 0.1 ± 0.06 mm, a sufficient amount of the electron-emitting substance adheres to the filament,
The rated lamp life is improved. Thus, FHF3
2 satisfies the specifications of the current value regulation at the time of applying a constant voltage and the preheating characteristics specified in JIS, and 255 ±
The rated lamp life of not less than 9000 hours and not more than 20,000 hours is ensured in both the lighting condition of the rated lighting of 30 mA and the lighting of the high output of 425 ± 50 mA.

[0007] The discharge lamp according to claim 2 includes a bulb;
2. An electrode for a discharge lamp according to claim 1, which is disposed in a bulb; and an electrode clamp for holding a clamped portion of the electrode for a discharge lamp.

[0008] In this configuration, since the discharge lamp electrode according to the first aspect is provided, the current value regulation and the preheating characteristic at the time of applying a constant voltage and the preheating characteristics specified in JIS are satisfied and 255 ± 30 mA. Rated lighting and 425 ± 50
FH with a rated lamp life of 9000 hours or more and 20,000 hours or less in both lighting conditions of high output lighting of mA
F32 is realized.

[0009]

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

FIG. 1 is a front view showing an embodiment of a discharge lamp electrode according to the present invention, FIG. 2 is a cross-sectional view of a discharge lamp having the same, and FIG. FIG. 4 is an enlarged cross-sectional view of a part of a leg portion of the electrode for a discharge lamp of the above.

In FIG. 2, reference numeral 10 denotes a discharge lamp.
Of the standard fluorescent lamp. The discharge lamp 10 has a straight tube-shaped glass bulb 11 as an arc tube.
, And both ends are sealed by the stems 12, respectively. In addition, a phosphor film 14 made of a three-wavelength emission phosphor is formed on the inner surface of the bulb 11, and a predetermined amount of mercury and a rare gas such as argon are sealed inside the bulb 11. Have been. In addition, each stem 12 has a pair of wells 16 each of which is a lead wire such as nickel.
Are airtightly pierced. Then, an electrode 21 for the discharge lamp is provided by an electrode clamp 17 provided at the tip of each well 16.
Is held.

The discharge lamp electrode 21 is shown in FIG.
As shown in FIG. 4, a filament 22 made of a tungsten wire or the like and an electron emitting substance 23 attached to the filament 22 are provided.

The filament 22 is a so-called triple coil in which a tungsten wire, that is, a tungsten wire is wound three times, that is, the tungsten wire is made thicker than the first primary core wire 25 and the first primary core wire 25. Wound around a first primary core 25 disposed along the first primary core 25 to form a first coil portion 31;
Next, the entire first coil portion 31 is wound around the secondary core wire to form a second coil portion 32, and further,
After winding the central portion of the second coil portion 32 around the tertiary core wire to form the third coil portion 33, the first primary core wire
It is formed by extracting core wires other than 25. Then, the portion where the third coil portion 33 was not formed, that is, the second coil portion 32 arranged linearly is a pair of leg portions 35.
A predetermined position of each leg 35 is a clamped portion 36 held by the electrode clamp 17.

The electron emitting substance 23 is also called a thermionic emitting substance or an emitter. Barium (Ba), strontium (Sr), calcium (C
It is mainly composed of the oxide of a). Then, the filament 22 is immersed in a carbonate solution of the electron emitting substance 23 to form a first coil part.
In the space formed by 31 and the second coil part 32, that is, between the pitch and the inside of the winding turn, it is applied and applied by drying, and further, the discharge lamp electrode 21 is irradiated with high frequency or the like in the discharge step of the discharge lamp 10. It is decomposed by heating to form an oxide.

The discharge lamp electrode 21 has a portion to be clamped 36, 20 degrees Celsius or more and 25 degrees Celsius or less.
The resistance value between 36 is 2.1 ± 0.3Ω, for example, 2.28Ω,
The weight between the clamped portions 36 of the filament 22 is 9.
0 mg or less, for example, 8.50 mg, and the weight between the clamped portions 36 of the electron emitting substance 23 is 2.0 mg or more and 4.0 mg or less, for example, 3.68 mg, and the pitch of the coils constituting the third coil portion 33 is separated in the pitch direction. The dimension A3 is 0.14 mm or less, for example, 0.09 mm, and the distance A2 in the pitch direction between the coils constituting the second coil section 32 located on the outer peripheral portion of the third coil section 33 is 0.1 ± 0.06 mm, for example, 0 mm. 0.093mm,
Is set within the conditions.

In this embodiment, the overall length L of the discharge lamp electrode 21 is 12.6 mm, the longitudinal dimension L3 of the third coil part 33 is 2.5 mm, the inner diameter d is 0.65 mm, and each leg The longitudinal dimension L2 of the portion 35 is 5.1 mm.

As described above, the discharge lamp 10 can be used in the FHF 32, which is a lamp dedicated to high-frequency lighting, at a temperature of 2 degrees Celsius.
Clamped parts 36, 36 in the range of 0 ° to 25 °
By setting the resistance between them to 2.1 ± 0.3Ω, the electrode current value characteristics can be improved, and the electrode current value standard when applying a constant voltage specified in JIS can be satisfied.

The clamped portions 36 of the filament 22
By setting the weight between 36 to 9.0 mg or less, the temperature-raising property is improved, that is, the preheating characteristics are improved, and the preheating characteristics standard specified in JIS can be satisfied.

Furthermore, by setting the pitch separation A3 between the coils constituting the third coil portion 33, which is the final turn of the triple coil, in the pitch direction to 0.14 mm or less, the heat diffusion during preheating is reduced and the temperature is efficiently increased. And the temperature characteristics of the electrode can be improved.

Further, a second coil portion located on the outer peripheral portion of the third coil portion 33 which is the last turn of the triple coil.
By setting the distance A2 in the pitch direction between the coils constituting 32 to 0.1 ± 0.06 mm, the electron emitting material
The weight (emitter weight) between the clamped portions 36, 36 of the 23 is secured to be 2.0 mg or more and 4.0 mg or less, that is, the filament 22 is held in a state where a sufficient amount of the electron emitting substance 23 is attached, The lamp life is improved, and the rated lamp life of 9000 hours or more and 20,000 hours or less can be secured in both the lighting state of 255 ± 30 mA rated lighting and 425 ± 50 mA high output lighting. That is, the second coil unit 32
By increasing the pitch separation A2 in the pitch direction, the volume capable of holding the electron-emitting substance 23 increases, but even if the separation is too large, the gap is not sufficiently filled with the electron-emitting substance 23, so to speak, the emitter Invites slimming. In particular, the outer peripheral portion of the third coil portion 33 is curved and the gap becomes large, so that it is difficult to fill the electron emitting substance 23, and further, the life of the electron emitting substance 23 is shortened due to falling off. On the other hand, by setting the separation dimension A2 to 0.1 ± 0.06 mm, a sufficient amount of the electron emitting substance 23 can be attached while preventing the electron emitting substance 23 from being thinned or dropped.

Thus, in this embodiment, FH
In F32, while satisfying the standard of the current value regulation and the preheating characteristic at the time of applying the constant voltage specified in JIS, the 25
In both the lighting condition of 5 ± 30mA rated lighting and 425 ± 50mA high output lighting, the rated lamp life of 9000 hours or more and 20,000 hours or less can be secured, and FHF32 that can easily secure these three items in the lamp manufacturing equipment is realized. it can.

[0022]

According to the discharge lamp electrode of the first aspect, by setting the resistance value between the clamped portions in the range of 20 degrees Celsius to 25 degrees Celsius to 2.1 ± 0.3Ω.
The electrode current characteristics can be improved, and the preheating characteristics can be improved by reducing the weight of the tungsten wire between the clamped portions of the filament to 9.0 mg or less, and the separation between the coils constituting the third coil portion is 0.14 mm or less. By doing so, it is possible to improve the temperature characteristics of the electrode by reducing the heat diffusion during preheating, and to set the distance between the coils constituting the second coil portion located on the outer peripheral portion of the third coil portion to 0.1 ±
By setting the thickness to 0.06 mm, a sufficient amount of the electron-emitting substance is attached to the filament, and the rated lamp life can be improved. Therefore, the FHF 32 can satisfy the specifications of the current value regulation and the preheating characteristic at the time of applying a constant voltage specified in JIS and the rated lighting of 255 ± 30 mA and 425.
The rated lamp life of not less than 9000 hours and not more than 20,000 hours can be ensured in both lighting states of high output lighting of ± 50 mA.

According to the discharge lamp of the second aspect, the provision of the electrode for the discharge lamp of the first aspect satisfies the specifications of the current value regulation at the time of applying a constant voltage and the preheating characteristics specified in JIS. In both the rated lighting of 255 ± 30 mA and the high output lighting of 425 ± 50 mA, 90
An FHF 32 having a rated lamp life of 00 hours or more and 20000 hours or less is realized.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a discharge lamp electrode of the present invention.

FIG. 2 is a cross-sectional view of the discharge lamp including the discharge lamp electrode.

FIG. 3 is a cross-sectional view of the discharge lamp electrode taken along the line II of FIG. 1;

FIG. 4 is an enlarged sectional view of a part of a leg portion of the discharge lamp electrode.

[Explanation of symbols]

 10 Discharge lamp 11 Bulb 17 Electrode clamp 21 Electrode for discharge lamp 22 Filament 23 Electron emitting material 32 Second coil part 33 Third coil part 35 Leg part 36 Clamped part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Genmine Yamamoto 6-78, Minamicho, Mishima-shi, Shizuoka F-term in Tec Mishima Plant (reference) 5C015 EE02

Claims (2)

[Claims] 1. A pair of leg portions each having a clamped portion held by an electrode clamp and having a double coiled second coil portion, and a second coil portion between these leg portions is further wound to form a triple coil. A filament having a third coil portion wound around the filament; and an electron emitting substance attached to the filament; and a resistance between the clamped portions in a range of 20 degrees Celsius to 25 degrees Celsius is 2 .1 ± 0.3Ω, Tungsten wire weight between clamped parts of filament is 9.0mg or less, Weight between clamped parts of electron emitting material is 2.0mg or more and 4.0mg or less, Third coil part is composed The distance between the coils to be
0.14mm or less, the distance between the coils constituting the second coil located on the outer periphery of the third coil is 0.1 ± 0.06m
m, an electrode for a discharge lamp, characterized in that: 2. A discharge lamp comprising: a bulb; a discharge lamp electrode according to claim 1 disposed in the bulb; and an electrode clamp for holding a clamped portion of the discharge lamp electrode. Discharge lamp.