JP4179295B2 - Discharge lamp - Google Patents

Description

The present invention relates to a discharge lamp in which an arc tube having a pair of electrodes and an arc tube support for fixing the arc tube are provided in an outer sphere provided with a base on one end side.

As ballasts used as lighting devices for discharge lamps, electronic ballasts having a small size, light weight, and high functions are becoming mainstream in place of conventional copper iron ballasts. However, a discharge lamp that is lit by a copper-iron ballast generates almost no vibration noise, but a discharge lamp that is lit by an electronic ballast with a rectangular wave lighting method vibrates due to the current gradient and overshoot during polarity reversal. In order to solve this problem, the noise of the pulse transformer in the igniter circuit that starts the lamp is generated. The number of inductors connected in series with the lamp is reduced and saturated at the time of rated lighting from the start of the lamp, so that the vibration of the stem provided in the outer bulb of the lamp is suppressed and the noise caused by the vibration is reduced. (See Patent Document 1).
JP 2004-47271 A

By the way, the discharge lamp of FIG. 10 according to the conventional product of the applicant of the present application is also lit by the electronic ballast of the rectangular wave lighting system, but there is a case where vibration noise that rarely becomes a product claim may occur. The discharge lamp includes a ceramic arc tube 3 having a pair of electrodes in an outer sphere 2 provided with a base 1 on one end side, and a column diameter of 1.6 mm made of nickel-plated iron wire for fixing the arc tube 3. The metal halide lamp is provided with arc tube struts 4L and 4R, and the arc tube 3 has a power feeding body 6 made of conductive cermet, niobium or the like connected to each electrode provided at both ends of the light emitting section 5 at both ends thereof. , 7 are formed, and the arc tube columns 4L, 4R supply lamp power to the power feeders 6, 7 inserted into the narrow tube portions 8, 9 formed at both ends of the arc tube 3. A power supply lead is configured.

In addition, in order to prevent the arc tube 3 from rupturing and the fragments from scattering, a transparent arc tube sleeve 10 made of quartz surrounding the outer periphery of the arc tube 3 is provided. A fixing plate (not shown) for holding and fixing the thin tube portions 8 and 9 of the tube 3 is provided, and the arc tube 3 and the arc tube sleeve 10 are integrated with each other.

The arc tube struts 4L and 4R are all fixed to a stem 11 provided on the base 1 side, and both ends of the arc tube sleeve 10 are pressed and held so as to be sandwiched between arc tube sleeve holders 12L, 12R and 13L and 13R. The arc tube 3 integrated with the arc tube sleeve 10 is fixed at a fixed position in the outer sphere 2.

Further, one arc tube support 4L is formed such that its column portion 14 extends in a direction parallel to the length direction of the arc tube 3, and an extension end of the column portion 14 is an arc tube sleeve. 10 is bent into a saddle shape so that one end side (the upper end side in FIG. 6) can be held between the arc tube sleeve pressers 12L and 12R. The lower end side of the arc tube sleeve 10 has an arc tube sleeve press 13L pressed by the column portion 14 of the arc tube post 4L and a short arc tube post 4R column whose tip only reaches the lower end of the arc tube sleeve 10. It is held so as to be sandwiched between the arc tube sleeve presser 13R pressed by the portion 15.

The column portion 14 of the arc tube support 4L is connected via a nickel ribbon wire 16 to a power feeder 6 inserted through a narrow tube portion 8 formed at the end of the arc tube 3 far from the base 1. At the same time, the column portion 15 of the arc tube post 4R is connected to the power feeder 7 inserted through the narrow tube portion 9 formed at the end of the arc tube 3 closer to the base 1 via the nickel ribbon wire 17, A feeding circuit for supplying lamp power to the arc tube 3 is formed.

When the cause of the vibration noise generated when the discharge lamp of FIG. 10 having the above configuration is turned on is investigated, a current in the reverse direction is generated between the arc tube 3 and the arc tube posts 4L and 4R when the lamp is turned on. The repulsive forces acting on each other due to Fleming's law act, and in particular, when a rectangular wave lighting electronic ballast is used, the lamp current waveform is half that of a copper iron ballast. Since the di / dt value at the time of cycle switching is large, a large electromagnetic force is generated at the time of switching, and the arc tube 3 and particularly the column portion 14 of the arc tube column 4L strongly repel each other, causing mechanical vibration. It was found that the vibration was transmitted to the outer sphere 2, the base 1 and the like and produced a loud noise that would be a complaint. Further, the arc tube 3 and arc tube posts 4L and 4R for fixing the arc tube 3 are integrally assembled together with the arc tube sleeve 10, and the arc tube posts 4L and 4R connect the arc tube 3 and the arc tube sleeve 10 together. It has also been found that having a thickness and rigidity that can secure the strength necessary for holding is a factor that further increases the vibration caused by the repulsive force.

In the present invention, when a discharge lamp is lit using a rectangular wave lighting type electronic ballast, the arc tube provided in the outer sphere of the lamp and the arc tube support for fixing the arc tube repel each other. It is a technical problem to reduce the vibrations generated and suppress the generation of noise due to the vibrations.

In order to solve the above-described problems, the present invention provides a rectangular wave lighting in which a ceramic arc tube having a pair of electrodes in an outer sphere having a base on one end side and an arc tube post for fixing the arc tube are provided. In a discharge lamp that is lit with an electronic ballast of the type, a portion of the arc tube column having a column portion extending in a direction parallel to the length direction of the arc tube is opposed to the arc tube of the column portion. A power supply lead for supplying lamp power is not configured, and a power supply lead connected to an electrode farther from the base side among the electrodes is formed by a lead wire having a diameter smaller than that of the column portion. The lead wires are wired in parallel with the pillars, and the lead wires are made of molybdenum wires or tungsten wires having a wire diameter A (mm) within the following numerical range, and are configured to be flexible with respect to the radial direction of the arc tube. It is characterized by .
0.0017 × W <A <1.0 (W: lamp power, 0.0017: constant) .

Even if the discharge lamp according to the present invention is lit with a rectangular wave lighting type electronic ballast, the column portion of the arc tube post extending in a direction parallel to the length direction of the arc tube is opposed to the arc tube. Since the portion that does not constitute a power supply lead for supplying lamp power to the arc tube, a current in the opposite direction to the arc tube flows through the portion facing the arc tube, and the column portion of the arc tube column and the arc tube No repulsive force is generated between them, and the arc tube support and the arc tube are vibrated by the repulsive force, so that no noise is generated. In addition, the power supply lead that is wired parallel to the column part and connected to the arc tube electrode far from the base side is not required to have the strength as the column part of the arc tube column. The lead wire has a diameter smaller than that of the arc tube. When the lamp is turned on, a current in the direction opposite to that of the arc tube flows through the lead wire, but the repulsive force generated between the arc tube and the arc tube is weak. Since vibration caused by force is small, noise caused by vibration is suppressed.

ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that the vibration which arises when a discharge lamp is lighted with the electronic ballast of a rectangular wave lighting system can be reduced, and generation | occurrence | production of the noise by the vibration can be suppressed.

The best mode of the discharge lamp according to the present invention is that an arc tube having a pair of electrodes and an arc tube support for fixing the arc tube are provided in an outer sphere provided with a base on one end side, and the length of the arc tube. The column portion of the arc tube support having a column portion extending in a direction parallel to the vertical direction constitutes a power supply lead for supplying lamp power to the arc tube substantially entirely including a portion facing the arc tube. The power supply lead connected to the electrode farther from the base side among the electrodes is formed by a lead wire having a diameter smaller than that of the column portion and wired so as to be parallel to the column portion. The lead wire is made of a refractory metal such as molybdenum, tungsten, tantalum or niobium, and more preferably a molybdenum wire or tungsten wire having a spring property and having a wire diameter of less than 1.0 mm. At the same time It is configured flexible in the radial direction of the arc tube.

1 is a longitudinal sectional view showing an example of a discharge lamp according to the present invention, FIG. 2 is a transverse sectional view of the discharge lamp taken along the chain line in FIG. 1, and FIG. 3 shows an example of wiring of lead wires of the discharge lamp. FIG. Compared with the conventional discharge lamp shown in FIG. 10, the discharge lamp shown in FIG. 1 has a column portion 14 of an arc tube post 4 </ b> L extending in a parallel direction along the length direction of the arc tube 3, and the one far from the base 1. The nickel ribbon wire 16 electrically connected to the power feeder 6 inserted into the narrow tube portion 8 formed at the end of the arc tube 3 is removed, and the power feeder is used instead of the nickel ribbon wire 16. The insulator 14 or the insulation resistance 18 that supports the arc tube support 4L on the arc tube support 4L is welded between the arc tube support 4L and the power feeder 6 so that the column portion 14 of the arc tube support 4L is connected to the arc tube 3. In general, including a portion facing the lamp tube, a part of the feed lead for supplying lamp power to the arc tube 3 is not configured, and instead of the column portion 14 of the arc tube post 4L, Between the base end side 22 of the pillar part 14 and the electric power feeder 6 The lead wire 19 having a length of about 100 to 150 mm that is electrically connected to supply lamp power to the arc tube 3 is different, and the other basic configuration is almost the same as the lamp of FIG. Therefore, the detailed description of the common part is omitted, and only the same reference numerals are given to the corresponding parts.

The lead wire 19 provided in the discharge lamp of FIG. 1 is a gap formed between the arc tube sleeve 10 that surrounds the outer periphery of the arc tube 3 and the arc tube sleeve holders 12L and 13L that fix the sleeve 10 to the arc tube support 4L. The lead wire 19 is wired so that one end of the lead wire 19 is inserted into the narrow tube portion 8 provided at one end of the arc tube 3 or the lead 21 of the insulation resistance 18 welded to the power feeder 6. The other end side is welded to the base end side 22 of the column portion 14 of the arc tube post 4L.

Then, several prototypes of the discharge lamp of FIG. 1 with different wire diameters and materials of the lead wires 19 and lamp power were made, and when these lamps were lit with a rectangular wave lighting electronic ballast having a frequency of 90 to 400 Hz, For example, a discharge lamp having a rated lamp power of 250 W using a molybdenum wire having a wire diameter of 0.6 to 0.9 mm as the lead wire 19 vibrates when the lead wire 19 vibrates, but the lead wire has a thin wire diameter. Therefore, the vibration was not transmitted to the outer sphere 2 and the base 1 and no noise was generated. Further, when the lead wire 19 is made of a tungsten wire, if the wire diameter exceeds 0.8 mm, a vibration sound appears, but the sound volume level is extremely small and it cannot be felt as noise. However, if the lead wire 19 has a wire diameter of more than 1.0 mm, both tungsten wire and molybdenum wire will generate noise that may cause complaints.

Similarly to the 250 W discharge lamp, the discharge lamp with the rated lamp power of 400 W generates noise when the wire diameter of the lead wire 19 made of molybdenum wire or tungsten wire exceeds 1.0 mm. In the case of 6 to 0.9 mm, no noise is generated. However, if a discharge lamp with a rated lamp power of 400 W uses a molybdenum wire or tungsten wire with a wire diameter of 0.6 mm as the lead wire 19, there is a problem that the lead wire 19 becomes red hot due to the lamp power. Also in a 250 W discharge lamp, when a molybdenum wire or tungsten wire having a wire diameter of 0.4 mm is used as the lead wire 19, the molybdenum wire is red hot and the tungsten wire is also slightly red hot.

From this test result, in order to prevent generation of noise due to vibration of the lead wire 19 and red heat due to lamp power (W) of the lead wire 19, the wire diameter A (mm) of the lead wire 19 is the following numerical value. It is desirable to select within the range ("0.0017" is a constant).
0.0017 × W <A <1.0

As shown in FIG. 1, it is preferable that one end side of the lead wire 19 is welded to the proximal end side 22 of the column portion 14 of the arc tube post 4L so that substantially the entire column portion 14 does not constitute a power supply lead. However, as shown in FIG. 3, even if one end side of the lead wire 19 is welded through the nickel ribbon wire 30 or the like in the middle of the column portion 14 of the arc tube post 4L and the middle portion constitutes a power feed lead, If the portion facing the arc tube 3 of the column portion 14 does not constitute a power supply lead, vibration noise is reduced as compared to the case where substantially the entire column portion 14 forms a power supply lead as shown in FIG. can do.

4 is a longitudinal sectional view showing another example of the discharge lamp according to the present invention, and FIG. 5 is a transverse sectional view of the discharge lamp taken along the chain line shown in FIG. Compared with the discharge lamp of Example 1 shown in FIG. 1, the discharge lamp of this example removes the insulator or the insulation resistance 18 provided between the arc tube support 4L and the power supply body 6 on one end side of the arc tube 3. And a nickel ribbon for connecting the power source 7 on the other end side of the arc tube 3 close to the base 1 in which the column portion 15 of the short arc tube column 4R is formed of an insulation resistance or an insulator 23. The wire 17 is wired from the proximal end side 24 of the column portion 15 to the power supply body 7 so that the short column portion 15 does not constitute a power supply lead for supplying lamp power to the arc tube 3. The arc tube sleeve holders 12L, 12R and 13L, 13R for fixing the arc tube sleeve 10 and the arc tube 3 to the arc tube struts 4L, 4R have holes 25 through which the lead wires 19 can pass. Designed for drilling Further been points are different, the other configurations are generally have in common with the discharge lamp of FIG.

The lamp of this example is not only the column portion 14 of the arc tube post 4L extending in the direction parallel to the length direction of the arc tube 3, but also the arc tube post that reaches only the end of the arc tube 3 on the base 1 side. Since the 4R column portion 15 also does not constitute a power supply lead, generation of noise due to vibration of the arc tube support is further suppressed than in the lamp of the first embodiment.

Further, the arc tube sleeve pressers 12L, 12R and 13L, 13R of Example 2 are the arc tube sleeve pressers 12L and 12R (13L and 13R) facing each other across the arc tube 3 as shown in the figure. It is configured to be integrally connected via a bar 27 in which a ring portion 26 for inserting and holding the narrow tube portion 8 (9) provided at the end portion is formed. The lead wire 19 is wired so as to be parallel to the column portion 14 of the arc tube post 4L through, for example, a hole 25 formed in the arc tube sleeve pressers 12L and 13L. In order to electrically insulate between the column portion 14 of the arc tube post 4L and the lead wire 19, an insulating pipe or the like through which the lead wire 19 is inserted is installed in the hole 25, or the arc tube sleeve presser 12L. , 12R and 13L, 13R are all or partly formed of an insulating material.

Next, FIG. 6 to FIG. 9 show other examples of the discharge lamp according to the present invention. These discharge lamps have a lead wire 19 in order to suppress generation of noise due to vibration of the arc tube 3 and the lead wire 19. Is configured to be flexible with respect to the radial direction of the arc tube 3.

That is, as shown in FIGS. 1, 3 and 4, the lead wire 19 is welded to the power supply body 6 whose one end is connected to the arc tube electrode far from the base 1 side, or to the power supply body 6. The other end side is fixed to the portion near the base 1 of the arc tube post 4L. However, if the lead wire 19 is wired in a tension state, immediately after the lamp is turned on. It has been found that a phenomenon occurs in which vibration noise occurs, and after a few minutes, the vibration noise subsides, and after a while, vibration noise occurs again. Then, the cause is that the lead wire 19 wired in a tensioned state is pulled by the thermal expansion of the arc tube 3 which becomes a high temperature when the lamp is turned on, and the tension increases, and the vibration of the arc tube 3 is a tensioned lead wire 19. It has been found that it is transmitted to the base 1 and the outer ball 2 via. Accordingly, as shown in FIGS. 6 to 9, the lead wire 19 is configured to be flexible with respect to the radial direction of the arc tube 3, so that the vibration of the arc tube 3 is absorbed and relieved, and the vibration is caused by the base 1 and the outer bulb. It was made not to be transmitted to 2.

First, the lead wire 19 shown in FIG. 6 has a one-side end that is welded and fixed to the power supply body 6 provided in the arc tube 3, for example, as shown in FIGS. By being bent in a Z shape or a Z shape, the configuration is flexible with respect to the radial direction of the arc tube 3.

Next, as shown in FIG. 7A, the lead wire 19 of FIG. 7 is bent at one end side to be welded and fixed to the power feeding body 6 provided in the arc tube 3, or is bent in a crank shape. As shown in b), the other end of the arc tube post 4L welded and fixed to the base end side 22 of the column 14 is bent in a dogleg shape so that the arc tube 3 extends in the radial direction. On the other hand, it has a flexible configuration. Note that both ends of the lead wire 19 may be bent as shown in FIGS. Further, the present invention is not limited to bending, and may be curved in an arc shape or a wave shape.

Next, the lead wire 19 shown in FIG. 8 is configured to be flexible with respect to the radial direction of the arc tube 3 by fixing one end side of the lead wire 19 to the power feeder 6 of the arc tube 3 via a conductive buffer 80. It has become. The cushioning material 80 is, for example, a nickel ribbon wire that is curved in a wave shape when viewed from the plane as shown in FIG. 8A, or is bent in a dogleg shape when viewed from the plane as shown in FIG. The two ends of the ribbon 19 are wound around the lead wire 19 and the power supply body 6 and crimped, and the crimped portion is welded so that one end of the lead wire 19 is fed via the cushioning material 80. It is fixed to the body 6.

Next, the lead wire 19 in FIG. 9 is formed in a coil shape as shown in FIG. 9A, or a coil-shaped buffer having one end side having conductivity as shown in FIG. 9B. By being fixed to the power feeding body 6 of the arc tube 3 through the material 90, the configuration is flexible with respect to the radial direction of the arc tube 3. Note that the lead wire 19 is not limited to a coil shape as a whole as shown in FIG. 9A, and a part of the lead wire 19 may be a coil shape. Further, the coil-shaped cushioning material 90 is not limited to the case where it is interposed on one end side of the lead wire 19 that is fixed to the power feeder 6 of the arc tube 3 as shown in FIG. 9B, but the lead that is fixed to the arc tube support 4L. The case where it interposes on the other end side of the line 19 may be sufficient. Further, it is preferable to use a buffer material 90 obtained by processing the same wire material as the lead wire 19 into a coil shape.

The present invention can suppress vibration noise generated when the discharge lamp is turned on and prevent a complaint due to the noise.

The longitudinal cross-sectional view which shows an example of the discharge lamp which concerns on this invention Cross section of the discharge lamp shown in FIG. The figure which shows the wiring example of the lead wire of the discharge lamp shown in FIG. Longitudinal sectional view showing another example of a discharge lamp according to the present invention Cross-sectional view of the discharge lamp shown in FIG. The figure which shows the other example of the discharge lamp which concerns on this invention The figure which shows the other example of the discharge lamp which concerns on this invention The figure which shows the other example of the discharge lamp which concerns on this invention The figure which shows the other example of the discharge lamp which concerns on this invention Longitudinal sectional view showing a conventional discharge lamp

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Outer sphere 3 Light emission tube 4L Light emission tube support | pillar 4R Light emission tube support | pillar 5 Light emission part 6 Electric power feeding body 10 Light emission tube sleeve 12L Light emission tube sleeve holding | suppressing 12R Light emission tube sleeve holding | maintenance 13L Light emission tube sleeve holding | maintenance 13 Pillar part 19 lead wire 25 hole 80 cushioning material 90 cushioning material

Claims (5)

In a discharge lamp that is lit by a rectangular wave lighting type electronic ballast provided with a ceramic arc tube having a pair of electrodes in an outer sphere provided with a base on one end side and an arc tube support for fixing the arc tube, The portion of the arc tube column that has a column portion extending in a direction parallel to the length direction of the arc tube and the portion facing the arc tube of the column portion constitutes a feed lead for supplying lamp power to the arc tube. The power supply lead connected to the electrode farther from the base side of the electrode is formed of a lead wire having a diameter smaller than that of the column portion and wired so as to be parallel to the column portion, and the lead A discharge lamp characterized in that the wire is made of a molybdenum wire or a tungsten wire having a wire diameter A (mm) within the following numerical range, and is configured to be flexible in the radial direction of the arc tube .
0.0017 × W <A <1.0 (W: lamp power, 0.0017: constant) The lead wire passes through a gap formed between the arc tube sleeve that surrounds the outer periphery of the arc tube and the arc tube sleeve holder that fixes the sleeve to the arc tube support, or is formed in the arc tube sleeve presser. discharge lamp according to claim 1 Symbol placement are wired so as to pass through the holes. Wherein by part of the lead wire is brought bent or curved, the lead wire, a discharge lamp of claim 1, wherein configured flexibly with respect to the radial direction of the arc tube. The by one end or both ends of the lead wire is fixed via a cushioning material having conductivity, the lead wire, a discharge lamp of claim 1, wherein configured flexibly with respect to the radial direction of the arc tube . It said by some or all of the lead wire is formed into a coil, the lead wire, a discharge lamp of claim 1, wherein configured flexibly with respect to the radial direction of the arc tube.

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