JP3319265B2 - High pressure metal vapor discharge lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure metal vapor discharge lamp having a getter provided in an outer tube.

[0002]

2. Description of the Related Art Generally, a high-pressure metal vapor discharge lamp in which an arc tube is provided inside a glass outer tube having a vacuum inside, adsorbs impure gas into the outer tube in order to maintain a high degree of vacuum in the outer tube. A so-called barium getter is provided.

Conventionally, as shown in FIG. 5, a high-pressure metal vapor discharge lamp having a barium getter in an outer tube 2 has a metal band 10 for holding a metal ring 4 holding a barium getter by a metal ring holding wire 9. And this metal band 1
No. 0 is wound around a stem 1 (Japanese Patent Laid-Open No.
8-137950).

[0004] Usually, the barium getter is a metal ring 4
Is held in. After the inside of the outer tube 2 is evacuated, the metal ring 4 is heated by high-frequency heating from the outside, and barium, which is an impurity gas adsorbing substance held by the metal ring 4, evaporates into the outer tube 2. By such a method, the residual gas in the outer tube 2 after the evacuation is adsorbed by barium, and the inside of the outer tube 2 can be brought into a high vacuum state. Alternatively, the gas released from the ceramic component can be adsorbed.

[0005]

However, in the conventional structure described above, when the metal ring 4 is heated at a high frequency to evaporate the barium getter, the metal band 10 wound around the stem 1 is also heated, and the stem 1 is heated. There is a problem that cracks occur. Further, in order to prevent such a crack of the stem, the power supply conductor 5b to the arc tube is used.
When the getter is provided, the getter is located away from the end of the outer tube, so that the area of the barium adhered to the outer tube 2 due to the high-frequency heating is increased, and the translucency is reduced and the appearance is impaired. Or will be. Furthermore, even if the metal ring support wire 9 is extended as much as possible so that the getter is located at the end of the outer tube in order to reduce the barium adhesion area, the accuracy of the shape of the metal ring support wire 9 and the power If the welding accuracy between the supply conductor 5b and the metal ring support wire 9 is insufficient, the metal ring 4 comes into contact with the outer tube 2 and the stem 1, and the heat generated when the metal ring 4 is subjected to high-frequency heating causes the metal ring 4 to be heated. Cracks will occur in the outer tube 2 and the stem 1 in contact with each other.

The present invention has been made to solve such a problem, and even when heating is performed by applying high-frequency power to a getter, cracks are generated in the outer tube or stem, light transmittance is reduced, and appearance is reduced. It is an object of the present invention to provide a high-pressure metal vapor discharge lamp capable of suppressing the loss of the gas.

[0007]

SUMMARY OF THE INVENTION A high pressure metal vapor discharge lamp according to the present invention has a stem at an end thereof and an arc tube in which mercury, a rare gas and a luminous metal are sealed in an outer tube having a vacuum inside. And a getter holder holding the getter, wherein the getter holder has an annular portion and the annular portion is
A notch formed in a part of the annular portion so as to be continuous, and the stem is inserted and provided in the annular portion. Also, the high-pressure metal vapor discharge lamp of the present invention
Inside the outer tube with a stem at the end and a vacuum inside
An arc tube filled with mercury, a rare gas and a luminescent metal,
And a getter holder holding the getter
The getter holder has an annular portion and an eddy current in the annular portion.
Notch formed in a part of the annular part so as not to flow
And the stem is inserted and mounted in the annular portion.
Have been killed.

As a result, the accuracy of the position of the getter in the arc tube can be improved, and when the getter holder is heated by high-frequency power, the getter holder is not heated, and cracks occur in the outer tube and the stem. Can be prevented. Further, since the getter holding member is provided on the stem, the getter can be positioned as far as possible at the end of the outer tube, so that a decrease in light transmission and a loss in appearance can be suppressed.

Further, the invention described in claim 2 has a configuration in which the getter holder has a larger heat capacity than the getter.

Thus, when the getter is heated at a high frequency, heating of the getter holder due to heat conduction from the getter can be suppressed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to an arc tube in which mercury, a rare gas and a luminous metal are sealed in an outer tube having a stem at an end and a vacuum inside. ,
And a getter holder holding a getter, the getter holder has an annular portion, and a cutout formed in a part of the annular portion, and the stem is inserted into the annular portion. Since the getter holder is provided with such an arrangement, the position accuracy of the getter in the arc tube can be improved, and when the getter holder is heated by high-frequency power, the getter holder is not heated by the eddy current.

The invention described in claim 2 is the first invention.
In the invention described in (1), since the getter holder has a larger heat capacity than the getter, it is possible to suppress heating of the getter holder due to heat conduction from the getter when the getter is heated at a high frequency.

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a high-pressure metal vapor discharge lamp according to an embodiment of the present invention has a stem 1 at one end, a closed end at the other end, and a vacuum inside. Further, an arc tube 3 in which mercury, a rare gas and a luminescent metal are sealed, and a getter holder 6 having a metal ring 4 holding barium, which is an impurity gas adsorbing substance, are provided. Current supply conductors 5a and 5b for supplying a current to the arc tube 3 from the outside are crush-sealed to the stem 1, and a getter holder 6 is fixed to the crush-sealed portion of the stem 1. The outer tube 2 is sealed with a stem 1, and a base 7 is provided on the stem 1 side of the outer tube 2.

As shown in FIG. 3, the getter holder 6 is
An annular portion 6a, a cutout portion 6b formed in a part of the annular portion 6a, a claw portion 6c for fixing a stem inserted into the annular portion 6a, and a link on both sides of the annular portion 6a. The projection 8 has a projection 8 and a metal ring 4 provided on the projection 8 for holding a barium getter.

As shown in FIG. 4, the getter holder 6 is fixed to the stem 1. That is, the getter holder 6 is inserted into the stem 1 by inserting the crush-sealed portion of the stem 1 into the cutout portion 6b of the getter holder 6.

The getter holder 6 is provided with a metal ring 4.
Therefore, even if the getter holder 6 is heated by conduction of heat generated in the metal ring 4, no crack is generated in the stem 1.

As described above, according to the present invention, since the notch 6b is provided in the annular getter holder 6, when the getter is heated at a high frequency, the getter holder 6 is applied by the high-frequency power applied to evaporate the barium getter. Is not directly heated, and since a large induced current does not flow through the getter holder 6, the generation of Joule heat is suppressed, and the generation of cracks in the stem due to the heating of the getter holder 6 can be prevented. Further, the mounting of the getter holder 6 to the stem 1 can be facilitated, and the projections 8 can be short, so that variations in position can be reduced and high-frequency heating of the metal ring 4 from the outside of the outer tube 2 can be efficiently performed. It can be carried out. Further, the getter holder 6 can be attached to the stem 1 immediately before the outer tube 1 is attached to the base 7, so that handling during the process is extremely easy, efficiency in the manufacturing process is improved by 10%, and defective The rate can be reduced by 5%.

[0018]

As described above, the high-pressure metal vapor discharge lamp of the present invention can generate cracks in the outer tube and the stem, reduce the light transmittance, and can be produced even when the high-frequency power is applied to the getter and heated. Can reduce the loss of the outer tube,
Since the handling of the getter holder during the process becomes extremely easy, the efficiency of the manufacturing process can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of a high-pressure metal vapor discharge lamp according to an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an enlarged perspective view of the getter holder.

FIG. 4 is an enlarged perspective view showing a getter holder attached to a stem.

FIG. 5 is a front view of a conventional high-pressure metal vapor discharge lamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stem 2 Outer tube 3 Arc tube 4 Metal ring 6 Getter holder 6a Annular part 6b Notch part 7 Base 8 Projection part

──────────────────────────────────────────────────続 き Continuing from the front page (72) Koichi Sugimoto, Inventor Koichi Sugimoto, Takatsuki-shi, Osaka, Japan Matsushita Electronics Corporation (56) References JP-A-58-137950 (JP, A) JP-A Sho JP-A-58-68859 (JP, A) JP-A-35-15988 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 61/26 H01J 61/34

Claims (3)

(57) [Claims] An arc tube having mercury, a rare gas and a luminous metal sealed therein, and a getter holder holding a getter are provided in an outer tube having a stem at an end and a vacuum inside. The getter holder includes an annular portion, and the annular portion.
And a notch formed in a part of the annular portion so as to be discontinuous, and the stem is inserted and provided in the annular portion. . 2. A vacuum pump having a stem at an end and a vacuum inside.
Mercury, rare gas and luminescent metal are sealed in an outer tube
Arc tube and getter holder holding getter
Wherein the getter holder has an annular portion, and the annular portion
Formed in a part of the annular portion so that eddy current does not flow through
A cut-out portion, and the stem is inserted into the annular portion.
High pressure metal vapor characterized by being worn
Discharge lamp. Wherein the getter holder is, claim 1 characterized in that it has a larger heat capacity than the getter or
A high-pressure metal vapor discharge lamp according to claim 2 .