JPH0326563Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to lamps for discharge tubes, especially cold cathode fluorescent lamps, and specifically relates to a lamp for a cold cathode fluorescent lamp. This invention relates to a mounting structure for a temperature fuse provided to prevent the lamp from burning out due to runaway.

〓Conventional technology〓 Some lamps that use conventional cold cathode fluorescent tubes as discharge tubes have a structure whose main parts are shown in Figure 3.
Unlike a hot cathode fluorescent tube, the discharge tube 1 used generates little self-heating, so it may be difficult to start up in cold weather such as winter. A net-shaped heater 2 is wrapped around the heater 2 by means such as etching, and at the time of startup, electricity is applied to this heater 2 to raise the temperature of the tube wall 1a to facilitate startup. The device maintains heat at a predetermined temperature to increase luminous efficiency. At this time, due to a malfunction in the control circuit, etc., the heater 2
There is a possibility that the lamp may burn out due to thermal runaway, so the reflector 3 located on the back side of the tube wall 1a in the irradiation direction may be made of a metal member or a resin member, etc., so that its upper surface is along the tube wall 1a. A holder 15 having a curved surface 15b and a hole 15a formed therein so as to accommodate a temperature fuse 4 is attached, and when the heater 2 goes out of control, the temperature fuse 4 blows out to prevent an accident.

<Problems to be solved by the invention> However, since the conventional holder described above is formed using a hard member such as metal or resin, it is difficult to deal with variations in the dimensions of the discharge tubes, for example. In this case, it is necessary to provide a gap between the pipe wall and the pipe wall in a size that takes into account this variation, and since it is impossible to bring the pipe into close contact with the pipe wall, it takes time for heat conduction and causes a delay in operation. Ta. In addition, mounting as described above requires high precision in parts and processes, which in itself causes an increase in costs.
For example, it is technically impossible to bring one temperature fuse into contact with two discharge tubes, and there is a problem in that the temperature fuses must be provided one-on-one, resulting in high costs.

〓Means for solving the problems〓 The present invention is a lamp in which a plurality of discharge tubes are arranged in parallel, and a temperature fuse and a temperature fuse. and a holder for holding the temperature fuse close to the tube wall of the discharge tube, wherein the holder is formed of an elastic member having high thermal conductivity and compressibility, and the holder has upper end portions on both sides. is shaped so as to be in close contact with two tube walls of the discharge tube, and is sandwiched between a reflector disposed on the back side of the discharge tube in the irradiation direction and the discharge tube of the lamp, and The above-mentioned conventional problems are solved by providing a temperature fuse mounting structure for a discharge tube lamp, which is characterized in that the temperature fuse is provided at an intermediate position where the discharge tubes are aligned.

〓Example〓 Next, the present invention will be explained in detail based on an example shown in the drawings.

In order to facilitate understanding, parts that are the same as those in the conventional example will be described with the same reference numerals, and descriptions of some overlapping parts will be omitted.

The holder indicated by reference numeral 5 in Fig. 1 is a holder according to the present invention, which is made of a material with high thermal conductivity and high compressive elasticity, which is made by mixing silicone rubber with fine powder such as boron nitride, which has excellent thermal conductivity. There is. This holder 1 is provided with a hole 5a for inserting and holding a temperature fuse 4 as in the conventional example, but since the holder 5 is formed of an elastic member, for example, the temperature fuse If the hole diameter of the hole portion 5a is made slightly smaller than the outer diameter of the hole portion 4, the hole portion 5a can be brought into close contact just by insertion, and excellent retention and heat conduction can be achieved. Further, as shown in FIG. 2, curved surfaces 5b and 5c are formed on both upper sides of the holder 5 so as to follow the tube wall 1a, and the holder 5 is arranged in parallel with the discharge tubes 1. By disposing it on the reflecting plate 3 at an intermediate position between the two discharge tubes 1, it is possible to contact the tube wall 1a of the two discharge tubes 1, and even in this arrangement, dimensional errors etc. can be avoided due to the compressive elasticity of the holder 5. is absorbed and comes into surface contact with the tube wall 1a, so the adhesion, that is, the thermal conductivity is also dramatically improved. At this time, it goes without saying that the temperature fuse 4 responds to the thermal runaway of the heaters 2 of the two adjacent discharge tubes 1.

〓Effect of the invention〓 As established above, the present invention provides a temperature fuse mounting structure for a discharge tube lamp in which the holder is formed of an elastic member having high thermal conductivity and compressibility, and both sides are formed of the discharge tube wall. The intermediate portion has a shape in which the discharge tubes of the lamp are aligned, and is sandwiched between a reflecting plate disposed on the back side of the discharge tube in the irradiation direction and the discharge tube of the lamp, and where the discharge tubes of the lamp are aligned. By arranging the holder to be located at a position of The adhesion can be easily improved by simply pressing the discharge tube onto the top of the holder, which improves heat conduction and speeds up the response when thermal runaway occurs, leading to excellent safety improvements. Moreover, it eliminates the need for high-precision parts and assembly processes, and reduces the number of temperature fuses by approximately half, which is also effective in reducing costs.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a holder of an embodiment of a temperature fuse mounting structure for a discharge tube lamp according to the present invention, and FIG. 2 is a front view showing the assembled state of the same embodiment.
FIG. 3 is a perspective view showing the main parts of a conventional example. 1... Discharge tube, 1a... Tube wall, 2... Heater,
3... Reflection plate, 4... Temperature fuse, 5... Holder, 5a... Hole, 5b, 5c... Curved surface.

Claims (1)

[Scope of utility model registration request] A lamp with multiple discharge tubes arranged in parallel.
In a temperature fuse mounting structure comprising a temperature fuse and a holder that holds the temperature fuse close to the wall of the discharge tube, the holder is formed of an elastic member having high thermal conductivity and compressibility, and The upper end portion is shaped to be in close contact with two tube walls of the discharge tube, and is sandwiched between the discharge tube of the lamp and a reflector disposed on the back side of the discharge tube in the irradiation direction, and . A temperature fuse mounting structure for a discharge tube lamp, characterized in that the temperature fuse is provided at an intermediate position where the discharge tubes of the lamp are aligned.