JPH05258725A - Metal halide lamp - Google Patents

Abstract

PURPOSE:To prevent the damage to a quarts sleeve due to a shock during transport in a metal halide lamp having the quarts sleeve for preventing rupture. CONSTITUTION:A quarts sleeve 2 having a weight of 24g is arranged around a luminous tube 1, which is having 150 W or less and in which iodide of Dy, Tl, and Cs, mercury, and argon are sealed, the upper and lower end parts of the quarts sleeve 2 are supported with C type support 4 and 4, which are sticked fast to the surface of a range over 200--300 deg. in a central angle with the axis of the quarts sleeve 2, caulked to the strut 3 having a straight line part length of 80 mm, as a center, and in which outer side folded parts 6 are provided on both ends. These are built in an outer bulb 7 to compose a metal halide lamp. This checks the runout of the quarts sleeve 2 from the supports 4 and 4 to prevent damage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal halide lamp having a quartz glass sleeve around an arc tube.

[0002]

2. Description of the Related Art Small metal halide lamps have an excellent property of high color rendering and are now widely used for lighting in commercial spaces. Since this type of lamp is used indoors, a quartz glass hollow tube (hereinafter referred to as a quartz sleeve) for preventing explosion is provided around the arc tube, and the quartz sleeve prevents the burst of the arc tube. The safety against lamp rupture is certainly increasing.

[0003]

However, in the metal halide lamp provided with the quartz sleeve, the quartz sleeve occupies a large weight in the lamp.
During transportation of the lamp, damage due to impact will occur with a high probability. This is the thickness and length of the column, the manner of welding with the stem, and the C that supports the quartz sleeve.
This is caused by the fact that the quartz sleeve is too heavy for the shape-holding band and the C-shaped holding band cannot support the quartz sleeve at the time of impact and the quartz sleeve comes off the holding band. In such a configuration, the drop test at the time of export specified in JISZ0200 cannot be endured, which is a serious problem in practical use.

The present invention has been made in order to solve the above problems in the conventional metal halide lamp having a quartz sleeve, and provides a metal halide lamp capable of preventing the quartz sleeve from being damaged even during transportation of the lamp. The purpose is to

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an arc tube in which a metal halide is enclosed, and an outer circumference of the arc tube provided with a small space between the arc tube and the column. In a small-sized metal halide lamp of 150 W or less equipped with a quartz glass sleeve having both ends supported by a C-shaped retaining band having a bent portion and an outer bulb incorporating these, the weight of the sleeve is 24 g or less, and a strut is used. When the length of the straight portion of the above is 80 mm or less, the C-shaped holding band is 200
It is configured to hold the sleeve in close contact with the surface in the range of up to 300 degrees.

In the metal halide lamp thus constructed, even if a shock is applied during transportation,
The quartz sleeve is prevented from coming off from the C-shaped holding band, and the quartz sleeve can be effectively prevented from being damaged.

[0007]

EXAMPLES Next, examples will be described. FIG. 1 is a perspective view showing an embodiment of a metal halide lamp according to the present invention. In the figure, reference numeral 1 denotes a 150 W arc tube in which a predetermined amount of iodide of Dy, Tl, Cs, mercury and argon are enclosed. Reference numeral 2 is a quartz sleeve having a weight of 24 g, which is arranged around the arc tube 1. The upper and lower outer peripheral portions of the quartz sleeve 2 are made of stainless steel (SUS304) with a diameter of 1.2 mm and a straight portion length of 80 mm. C crimped to 3
It is supported by the shape-retaining bands 4, 4. The C-shaped retaining band 4 is made of stainless steel (SUS30 having a thickness of 0.4 mm and a width of 4 mm).
4) It is made of a plate and is closely attached to the outer circumference of a range of a central angle of 240 degrees around the axis of the quartz sleeve 2, and the claw portion 5 is locked to the edge of the quartz sleeve 2 to hold the quartz sleeve 2. Is configured to. A bent portion 6 that is bent outward is formed at the tip of the C-shaped holding band 4.

The arc tube 1 and the quartz sleeve 2 are incorporated in a T-shaped outer bulb 7 to form a metal halide lamp. In the figure, 8 is a spring-like blade that serves as a column fixing auxiliary means provided on the curved portion 3a of the column 3 arranged on the top side of the outer ball 7, and 9 is a barium getter.

In the metal halide lamp thus constructed, the quartz sleeve 2 is supported by the C-shaped holding bands 4 and 4 which are in close contact with the outer circumference of the quartz sleeve 2 in the range of the central angle of 240 degrees. Even if a shock is applied, the quartz sleeve 2 is prevented from coming off the C-shaped holding band 4, and the damage is prevented. Further, since the C-shaped holding band 4 is provided with the claw portion 5 and is locked to the end edge of the quartz sleeve 2, vertical movement of the quartz sleeve 2 is also prevented, and the quartz sleeve 2 can be firmly held. Furthermore, since the holding band 4 is formed in a C shape, when the getter 9 is heated by high frequency heating,
Heat generation due to eddy current is reduced, and deterioration of the material of the stainless steel holding band 4 can be avoided. Further, since the bent portions 6 are provided at both ends of the C-shaped holding band 4, even if the support pillar 3 is bent when an impact is applied, the quartz sleeve 2 and the outer sphere 7 are prevented from directly colliding with each other. It plays the role of a cushion and prevents the quartz sleeve 2 from being damaged.

According to the present invention, when the weight of the quartz sleeve 2 is 24 g or less and the length of the straight portion of the supporting column is 80 mm or less, the C-shaped retaining band has a central angle of 200 to 300.
Although it is specified that the sleeve is held in close contact with a range of degrees, an experiment conducted to specify such a range will be described below. First, with the same configuration as that of the embodiment shown in FIG. 1, the central angles of the C-shaped holding band 4 to be closely held on the quartz sleeve 2 are 190 °, 200 °, 240 °, 280.
12 lamps were made for each of °, 300 °, and 320 °, and a drop test based on JISZ0200 was conducted.
The damage situation of the quartz sleeve was investigated. This drop test
This test is repeated 3 times by free fall from 80 cm above 1 corner, 3 edges, and 6 sides. The test results are shown in Table 1.

[0011]

[Table 1]

As can be seen from Table 1, when the center angle was 190 °, a considerable amount of the quartz sleeve was broken into pieces. The cause of this damage is that the quartz sleeve came off from the stainless steel C-shaped holding band during the drop test, and as a result, was broken by a direct collision with the outer sphere. Further, when the central angle was 320 °, cracks were generated in the quartz sleeves of the three lamps. This is because the bending portions provided at both ends of the C-shaped retaining band act as a cushion in a narrow range, and the quartz sleeve directly collides with the outer sphere through the portion other than the bending portion of the C-shaped retaining band. However, the inner surface of the outer sphere corresponding to the crack generated in the quartz sleeve was found to have scratches that seemed to have occurred during the collision. In addition, the central angle
No damage to the quartz sleeve occurred in the lamp using the C-shaped holding band at 200 to 300 degrees.

From the above experimental results, in the present invention, the central angle of the C-shaped retaining band with respect to the quartz sleeve is 200-200.
It is constructed so as to be in close contact with the range of 300 degrees.

In the above experiment, the lamp power was 150 W and the weight of the quartz sleeve and the length and thickness of the straight portion of the column were constant, but the wattage of this type of lamp was 70 to 150 W. For a lamp of less than 150 W, the weight of the quartz sleeve and the length of the column are smaller than that of the lamp of 150 W, so if the safe range for holding the C-shaped holding band to keep the quartz sleeve at 150 W is Of course, it is safe against damage due to impact, and therefore the present invention is sufficiently applicable to a lamp of less than 150 W.

[0015]

As described above on the basis of the embodiments,
According to the present invention, it is possible to prevent the quartz sleeve from coming off from the C-shaped holding band even during impact during transportation, and to prevent the quartz sleeve from being damaged.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a metal halide lamp according to the present invention.

FIG. 2 is a plan view of a C-shaped holding band.

[Explanation of symbols]

 1 Luminous Tube 2 Quartz Sleeve 3 Column 4 C-Shaped Retaining Band 5 Claw 6 Bent 7 Outer Sphere 8 Blade 9 Getter

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takashi Mine 1-1 Iriyama-cho, Gyoda-shi, Saitama Iwasaki Electric Co., Ltd. Saitama Manufacturing Co., Ltd. (72) Fumio Koyama 1-1 Iriyama-cho, Gyoda-shi, Saitama Iwasaki Electric stock company Saitama Factory

Claims (1)

[Claims] 1. A quartz tube in which a metal halide is enclosed, and a quartz tube provided with a small interval on the outer circumference of the arc tube and having both ends supported by C-shaped holding bands having outer bent portions attached to the columns. In a small metal halide lamp of 150 W or less equipped with a glass sleeve and an outer bulb incorporating these, if the weight of the sleeve is 24 g or less and the length of the straight portion of the column is 80 mm or less, the C-shaped holding band The metal halide lamp is configured so as to hold the sleeve in close contact with a surface in a range of a center angle of 200 to 300 degrees about the axis of the quartz sleeve.