JPH03177006A - Lighting device for discharge lamp - Google Patents

Abstract

PURPOSE:To suppress noises positively by interposing a resin having excellent thermal conductivity and vibration absorptivity only between a case constituting a ballast stabilizer and a coil. CONSTITUTION:A ballast stabilizer body 3 is incorporated into a case 1, the ballast stabilizer body 3 is constituted by rewinding a coil 7 on a core 5, and a resin 9 is interposed only between the case 1 and the coil 7. According to the constitution, the resin 9 positively transmits the temperature of the coil 7 over the case 1 while inhibiting the vibrations of the coil 7, thus surely suppressing the noises of the ballast stabilizer without elevating the temperature of the ballast stabilizer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention particularly relates to a compact and lightweight lighting device for a high pressure discharge lamp.

[Conventional technology]

Conventionally, high-frequency inverter-type ballasts have been used to reduce the size and weight of ballasts for high-pressure discharge lamps, but this ballast has difficulty preventing arc fluctuations and is made of steel. The disadvantage is that the cost is higher than that of the ballast. On the other hand, if a large number of ballasts and discharge lamps are connected to the output side of an audio frequency inverter and the discharge lamps are lit, all of the above-mentioned drawbacks will be eliminated, and it will not be possible to use them in this way. Since the ballast is driven at a relatively low frequency, it has the advantage that its case can be formed using inexpensive silicon steel sheets instead of ferrite and using conventional manufacturing methods.

[Problem to be solved by the invention]

However, when an audio frequency inverter is used to drive a ballast and turn on a discharge lamp, the sound generated by the ballast becomes louder. The problem is that the temperature rises.

Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional technology - to reliably suppress the generation of noise when lighting a discharge lamp without increasing the temperature inside the ballast. An object of the present invention is to provide a discharge lamp lighting device.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an inverter that converts a commercial frequency to a higher frequency, a plurality of ballasts connected to this inverter, and a discharge lamp connected to each of these ballasts. In electric light lighting equipment,
The ballast is characterized in that a resin having excellent thermal conductivity and vibration absorption properties is interposed only between the case and the coil constituting the ballast.

[For production]

According to the present invention, the coil that makes up the ballast is a part of the ballast that gets significantly higher in temperature, but is also relatively vulnerable to temperature, and also generates less noise than the core that makes up the ballast. By filling the resin only in the part where the core is removed, that is, between the case and the coil, this resin absorbs vibration while dissipating heat, so the ballast can be used without increasing the internal temperature. It is possible to reliably suppress noise from

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the discharge lamp lighting device according to the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 indicates the ballast case. A known ballast main body 3 is incorporated into the case 1, and the ballast main body 3 is constructed by winding a coil 7 around a core 5. In addition, the case 1 is filled with resin,
The stabilizer main body 3 is supported and fixed within the case 1 by this resin.

The resin used is one that has excellent thermal conductivity and excellent vibration absorption properties, and in the conventional one, the entire periphery of the core 5 and coil 7 is filled with resin, as shown in Fig. 5. .

By the way, in the ballast main body 3, the coil 7 is a part that is relatively vulnerable to temperature even though the temperature becomes extremely high, and this coil 7 is a part that generates less noise than the core 5. Therefore, in order to suppress noise from the ballast by absorbing vibration while dissipating heat, it is sufficient to fill the resin only between the case 1 and the coil 7, and the present invention is configured in this way. .

2 and 3 show specific embodiments of the invention. According to the example shown in FIG. 2, resin 9 is filled only between the case 1 and the coil 7, and according to the example shown in FIG.
One side a between the case 1 and the coil 7 is filled with resin 9, and on the other side, the anti-vibration rubber 11 is applied to the side surface of the core 5, and the anti-vibration rubber 11 and the case 1 are bonded together. A resin 9 is interposed between them.

According to these configurations, the resin 9 is connected to the coil 7.
The temperature of the coil 7 is reliably transmitted to the case 1 while suppressing the vibration of the ballast, without increasing the temperature of the ballast.
The noise can be suppressed reliably.

FIG. 4 shows the results of experimental noise measurements. Second
As shown in the figure, the dotted line shows the result when the resin 9 was filled only between the case 1 and the coil 7, and the solid line shows the result when the entire inside of the case 1 was filled as shown in FIG.

In addition, A-D indicates the measurement position, A is the bottom of the case, B
indicates the measurement at the top of the case, C indicates the measurement at the top of the side of the case, and D indicates the measurement at the bottom of the same side. According to this, case 1
It was confirmed that the case where the entire interior was filled with the resin 9 produced significantly more noise than the case where the resin 9 was partially filled.

According to this, since this ballast can be used by being connected to an audio frequency inverter, the lighting system for a high pressure discharge lamp can be made smaller and lighter.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, since a resin having excellent thermal conductivity and vibration absorbing properties is interposed only between the case and the coil that constitute the ballast, this resin By transmitting the temperature of the coil to the case while suppressing the transmission of vibrations, the noise can be reliably suppressed without increasing the temperature of the ballast. Therefore, when this ballast is connected to an audio frequency inverter, Therefore, the lighting system for a high-pressure discharge lamp can be made smaller and lighter.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the entire discharge lamp lighting device according to the present invention, FIGS. 2 and 3 are sectional views showing specific embodiments of the present invention, and FIG. 4 is a diagram showing the results of noise measurement. , FIG. 5 is a sectional view of a conventional example. 1... Case, 3... Stabilizer body, 5... Core,
7... Coil, 9... Resin, 11... Anti-vibration rubber. Dawn map 2nd 3rd figure

Claims (1)

[Claims] an inverter that converts the commercial frequency to a higher frequency;
In a discharge lamp lighting device consisting of a plurality of ballasts connected to this inverter and discharge lamps respectively connected to these ballasts, the ballast has thermal conductivity only between the case and the coil that constitute the ballast. , and a discharge lamp lighting device interposed with a resin having excellent vibration absorption properties.