JP4749910B2 - Lamp power supply structure - Google Patents

Description

  The present invention relates to a power feeding structure for a lamp, and more particularly to a power feeding structure for a lamp that facilitates positioning of the lamp and is suitable for automatic manufacturing.

  A conventional lamp feeding structure is as shown in FIG. A conventional power feeding structure will be described with reference to FIG. An electrode 9 is disposed in the glass arc tube 10. The electrode 9 is connected to the metal foil 13 via the lead rod 12. The metal foil 13 is sealed by a glass sealing tube 14 to obtain airtightness between the inside and outside of the arc tube. The base 1 is fixed to the sealing tube 14 with an adhesive (not shown). The base 1 is electrically connected to the electrode 9, and electric power is supplied to the electrode 9 through the base 1. The end of the base 1 is provided with a cylindrical base holding part 16 (convex part), and the base part (not shown) of the lamp is provided with a concave part to hold the lamp.

  The silver brazing process of the conventional power feeding structure will be described with reference to FIGS. FIG. 6A shows a state in which the base 1 is fixed to the sealing tube 14. The lead wire 2 is drawn out through the base holding part 16. The sealing tube 14 is fixed by the adhesive 6 in a state in which the sealing tube 14 is fitted in the base 7. FIG. 6B shows a state in which the lead wire 2 coming out from the base holding part 16 is cut. The lead wire 2 drawn out through the base holding part 16 is cut at a desired position protruding from the base holding part end 4. Cut the lead wire, place the required amount of silver solder on the end of the lead wire, and heat with a burner or the like. At this time, since it is difficult to cut the lead wire on the inner side of the base from the end of the base holding part, the lead wire end part 11 slightly protrudes from the end of the base holding part. FIG. 6C shows a state in which the silver wire 5 is poured into the gap between the lead wire 2 and the base holding part 16 to connect the lead wire and the base. As a result, the lead wire and the base are electrically and mechanically firmly connected.

  The base holding part 16 is heated with a burner or the like to pour silver wax. At this time, not only the vicinity of the end 4 of the base holding part but also the entire base holding part 16 is heated. In this way, the silver solder 5 enters the gap between the base holding part 16 and the lead wire 2 by a capillary phenomenon, so that the silver solder 5 can be poured toward the inner part 7 of the base. When the lead wire is a single wire, silver solder is poured into the gap between the base holding portion and the lead wire. In the case where the lead wire is composed of a plurality of wires (for example, stranded wires), the silver wax is also poured into the gap between the lead wires themselves by capillary action. Thereafter, the single wire and the stranded wire are not distinguished from each other and are poured into the gap between the base holding portion and the lead wire. If the silver wax is not sufficiently poured into the base holding part, heat may be generated due to poor electrical connection between the lead wire and the base, and the lamp may be damaged. Therefore, it is necessary to pour a prescribed amount of silver wax. This process of pouring silver brazing is called a silver brazing process.

  As a conventional example, a lamp with a specification for cutting the lead wire around the end of the base holding portion has been described, but the lead wire was drawn out from the base holding portion to the outside without cutting the lead wire around the base holding portion. In the power supply structure in which power is supplied by a crimp terminal or the like in the state, the base and the lead wire may be connected in the same manner. Without cutting the lead wire, place the necessary amount of silver solder around the lead wire and heat with a burner or the like. By connecting and fixing the lead wire to the base, it is possible to prevent the metal foil or the sealing tube from being damaged even when the lead wire is pulled through a crimp terminal or the like.

  In the conventional power feeding structure proposed by the present applicant in Patent Document 2, a convex or concave positioning engagement portion is provided on the peripheral surface of the base holding portion. The lamp mounting position is uniquely determined to prevent the lamp life from being shortened due to poor positioning of the lamp. By changing the shape of the positioning engagement portion, the type and direction of the lamp to be mounted can be limited. Below are some examples of prior art related to this.

  The “tube feeding structure” disclosed in Patent Document 1 is one in which no stress is applied from the lead wire to the sealing portion. When a stranded wire lead wire and a lead rod are joined together by silver brazing, the silver solder penetrates into the gaps between the lead wire wires, and the lead wire is solidified to a certain length from the joint portion. The flexibility of the line is lost. This is a structure for avoiding this. A lead bar protrudes from the sealed portion of the tube of the discharge lamp. The tip of the stranded wire lead wire to be joined to the lead rod is heated and melted to be cooled and solidified. Thereafter, the lead wire is joined to the lead rod by joining the solidified portion and the lead rod by silver brazing or the like. The lead wire is inserted into the base, and the tip of the lead wire is joined to the base pin portion. In this way, the flexibility of the lead wire is maintained.

The “short arc type discharge lamp” disclosed in Patent Document 2 can accurately determine the mounting position, and there is no lack of cooling due to the fixing material inside the base, so that no unlighting, breakage or rupture will occur. This is a discharge lamp. A base holding part for mounting to the lamp is provided at the ends of both bases of the discharge lamp. A positioning engagement portion for specifying the mounting position is provided around at least one of the both cap holding portions. A plurality of opening holes are provided on the side surfaces of both caps at positions not facing each other.
JP 09-045285 A Japanese Patent Laid-Open No. 2003-297228

  However, the conventional power feeding structure has the following problems. The silver brazing process is difficult to automate because it must rely on the judgment of the operator. It is difficult to control the amount that the silver solder melts and the amount that the silver solder flows into the gap between the base holding portion and the lead wire so that they match. Therefore, the melted silver solder flows down to the outside before flowing into the gap between the base holding part and the lead wire. Alternatively, the silver solder flows too much into the gap between the base holding part and the lead wire, and the end surface of the lead wire is exposed from the silver solder, or the connection between the lead wire and the base becomes insufficient.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and enable automatic manufacture of a lamp feeding structure.

  In order to solve the above-described problem, in the present invention, an end portion of a base of a power feeding structure of a lamp including a lead wire that feeds an electrode disposed inside the arc tube and a base connected to the lead wire. In addition, an injection tank for pouring a connecting material for connecting the base and the lead wire is provided. The pouring tank is a base ring that engages with an engaging portion provided at an end of the base. The base ring is provided with a positioning engagement portion for mounting the lamp.

  By configuring as described above, it is possible to prevent the silver brazing from flowing outside even if the silver brazing process is automated. Further, since there is no shortage of silver wax flowing into the base holding part, heat is not generated due to poor electrical connection between the lead wire and the base, and accidents such as lamp breakage can be prevented. Furthermore, since the silver brazing process can be automated with any shape of the die, the design freedom of the shape of the die is increased.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to FIGS.

  In Embodiment 1 of the present invention, the lead wire is cut around the end of the base holding portion, the base ring is engaged with the engaging portion provided at the end of the base, and the silver brazing material is poured into the base ring. Thus, there is provided a power feeding structure for a lamp in which a lead wire for feeding power to an electrode arranged inside the arc tube and a base are connected.

  FIG. 1 is a conceptual diagram showing a power feeding structure for a lamp in Embodiment 1 of the present invention. In FIG. 1, a base 1 is a member for supplying power to the lamp from the outside and holding the lamp. The lead wire 2 is a conductive member for supplying power from the base to the inside of the lamp. The base holding part 3 is a member for holding the lamp with the lighting tool. The silver solder 5 is a member that connects the base and the lead wire. In each embodiment, an example in which silver solder is used as a connecting material will be described, but solder or the like can also be used as a connecting material. The electrode 9 is an electrode for discharging in the lamp. The arc tube 10 is a glass tube that seals the discharge space. The lead bar 12 is a member for holding and supplying power to the electrode. The metal foil 13 is a conductive member for supplying power to the lead bar. The sealing tube 14 is a member that holds the power feeding member and seals the arc tube. The base ring 18 is a member that accumulates silver brazing in the silver brazing process.

  2A to 2C are partial cross-sectional views illustrating the manufacturing process of the power feeding structure of the lamp. In FIG. 2, the adhesive 6 is a member that fixes the sealing tube to the base. The base interior 7 is a space in which the sealing tube is accommodated in the base. The melting tank 8 is a silver solder reservoir formed by a base ring. The engagement step portion 15 is a step portion for stably holding the base ring. Although the concave engagement step portion will be described, a configuration in which the concave engagement step portion is fitted coaxially may be used. The lead wire end portion 11 is a cut end obtained by cutting the lead wire. The base holding portion end 4 is a protruding end portion of the engaging step portion of the base holding portion.

  The function and manufacturing method of the power feeding structure of the lamp according to the first embodiment of the present invention configured as described above will be described. First, the outline of the function of the power feeding structure will be described with reference to FIG. A base ring 18 for forming a silver wax injection tank is fitted into the base holder 3. In a state where the base ring 18 is fitted, the base ring 18 is fixed to the base 1 by the silver solder 5. An electrode 9 is disposed in the glass arc tube 10. The electrode 9 is connected to the metal foil 13 via the lead rod 12. The metal foil 13 is sealed by a glass sealing tube 14, and the inside of the arc tube is airtight with respect to the outside. The base 1 is fixed to the sealing tube 14 with an adhesive (not shown). The base 1 is electrically connected to the electrode 9 via the lead wire 2, and electric power is supplied to the electrode 9 via the base 1. A cylindrical base holding part 3 (convex part) is provided at the end of the base 1. A lamp can be held at a desired position by providing a recess in a lamp holder (not shown) of the lamp.

  Next, a manufacturing process of the power feeding structure for the lamp will be described with reference to FIG. As shown in FIG. 2A, the sealing tube 14 is fixed by the adhesive 6 in a state where the sealing tube 14 is fitted in the base 7. Further, the lead wire 2 is drawn out through the inside of the base holding part 3 and is cut at the position of the tip of the base holding part 3. The cap holding part end 4 is provided with an engaging step 15 formed over the circumference so as to be concave due to the step.

  As shown in FIG. 2 (b), a cap ring 18 serving as a silver wax injection tank is fitted into the concave engagement step portion 15. By fitting the base ring 18 to the concave engagement step portion 15, the melting tank 8 for storing the melted silver solder is formed on the lead wire end portion 11. With such a configuration, if the silver brazing is continuously heated, it can be maintained on the end surface of the lead wire until it penetrates into the gap between the base holding part 3 and the lead wire 2, so that the melted silver You can prevent the wax from flowing outside. Even when the amount of silver solder flowing into the gap between the base holding part 3 and the lead wire 2 is large, the melting tank can be obtained by lengthening the base ring 18 in the axial direction or increasing the inner diameter of the base ring 18. Since 8 can be increased, the molten silver solder can be stored on the end portion 11 of the lead wire.

  As shown in FIG. 2C, the base holding part 3 and the base ring 18 are heated by a burner or the like, and the silver solder 5 is poured. Thus, by pouring silver wax into the base ring 18 which is an injection tank, the base holding part 3 or the base 1 and the lead wire 2 are electrically connected, and both are mechanically and firmly coupled. Become. The base ring 18 is also connected to the base holding part 3 by silver solder.

  As described above, in the first embodiment of the present invention, the power feeding structure of the lamp is cut at the periphery of the end of the base holding portion, and the base ring is engaged with the engaging portion provided at the end of the base. Combined, the silver brazing material is poured into the base ring, and the lead wire for supplying power to the electrode disposed inside the arc tube is connected to the base, so that the molten silver wax is stored in the molten layer and poured. As a result, the melted silver solder can be prevented from flowing outside, and the silver brazing process can be automated.

  In the second embodiment of the present invention, the lead wire is not cut around the end of the base holding portion, but the base ring is engaged with the engaging portion provided at the end of the base, and the silver brazing material is poured into the base ring. Thus, there is provided a power feeding structure for a lamp in which a lead wire for feeding power to an electrode arranged inside the arc tube and a base are connected.

  FIG. 3 is a cross-sectional view showing a power feeding structure for a lamp in Embodiment 2 of the present invention. In FIG. 3, a lead wire 2 is a conductive member for supplying power from the base to the inside of the lamp. It is not cut around the end of the base holding part. The base ring 19 is a member that accumulates silver brazing in the silver brazing process.

  The function and manufacturing method of the power feeding structure for the lamp in the second embodiment of the present invention configured as described above will be described. The lead wire 2 is not cut around the end of the base holding part, and is welded to the base 1 with a silver solder 5. A convex engaging step 15 is provided at the end of the base holding part, and the base ring 19 and the base holding part 3 constituting the injection tank are fitted coaxially.

  In the same manner as in the first embodiment, in the silver brazing process, a melting tank for storing the melted silver solder 5 is formed around the lead wire 2 by fitting the base ring 19 to the end of the base holding part. Therefore, it can prevent that the melt | dissolving silver wax 5 flows outside. With this configuration, the silver brazing process can be automated. The outer peripheral surface of the end portion of the base holding portion and the inner peripheral surface of the base ring 19 are fitted. However, in this fitting method, the melted silver solder 5 may ooze out from the fitting portion. As a countermeasure, the melting silver solder 5 oozes out from the fitting portion by fitting the inner peripheral surface of the end of the base holding portion and the outer peripheral surface of the base ring 19 as in the first embodiment. Can be prevented.

  As described above, in Embodiment 2 of the present invention, the power feeding structure of the lamp is engaged with the base ring at the engaging portion provided at the end of the base without cutting the lead wire around the end of the base holding part. Combined, the silver brazing material is poured into the base ring, and the lead wire for supplying power to the electrode disposed inside the arc tube is connected to the base, so that the molten silver wax is stored in the molten layer and poured. As a result, the melted silver solder can be prevented from flowing outside, and the silver brazing process can be automated.

  Example 3 of the present invention forms a dissolution tank by engaging a base ring having a positioning engagement part with an engaging part provided at an end of the base, and poured a silver brazing material into the base ring, It is a power feeding structure of a lamp in which a lead wire for feeding power to an electrode disposed inside the arc tube and a base are connected.

  FIG. 4 is a conceptual diagram showing a power feeding structure for a lamp in Example 3 of the present invention. FIG. 4A is an external view of the base viewed from the base ring side. FIG. 4B is a cross-sectional view taken along the line BB ′ in FIG. In FIG. 4, the positioning engagement portion 17 is a portion that determines the position where the lamp is attached. The base ring 20 is a member that accumulates silver brazing in the silver brazing process. Although the case where the lead wire is cut at the end of the base holding portion will be described, the same configuration can be made even when the lead wire is not cut at the end of the base holding portion.

  The function and manufacturing method of the power feeding structure for the lamp according to the third embodiment of the present invention configured as described above will be described. As shown in FIG. 4, the base ring 20 having the positioning engagement portion 17 is fitted to the end portion 4 of the base holding portion, and silver brazing is performed. A convex engagement step portion 15 is provided, and the base ring 20 and the base holding portion 3 are fitted coaxially. Since the positioning engagement portion 17 is provided on the circumferential surface of the base ring 20, it is possible to attach the lamp so that the direction of the lamp in the circumferential direction is accurately matched.

  As in the first embodiment, in the silver brazing process, by fitting the base ring 20 to the base holding part end 4, a melting tank for storing the melted silver solder is formed on the end face of the lead wire. Therefore, it is prevented that the molten silver wax flows out to the outside. With this configuration, the silver brazing process can be automated.

  Further, in order to sufficiently heat the lead wire in the base holding part 3, even if the thickness of the base holding part 3 is reduced, the positioning engagement part 17 is increased by increasing the outer diameter of the base ring 20. Since the shape can be determined freely, it can have an arbitrary cross-sectional shape. Even if the thickness of the base holding portion 3 is reduced, a characteristic positioning engagement portion can be formed for each lamp type and electrode polarity, so that the lamp type and polarity can be prevented from being attached to the lamp by mistake. By changing only the inexpensive base ring, the base can be used as a common part, so the stock of the base can be reduced.

  As described above, in the third embodiment of the present invention, a melting tank is formed by engaging a base ring having a positioning engaging portion with an engaging portion provided at an end portion of a base of a lamp feeding structure. In addition, since the silver brazing material is poured into the base ring and the lead wire for supplying power to the electrode disposed inside the arc tube is connected to the base, the molten silver wax is stored in the melted layer and poured. Thus, the molten silver solder can be prevented from flowing out to the outside, and the silver brazing process can be automated.

  The lamp feeding structure of the present invention is easy to position the lamp and is optimal for automatic manufacturing.

It is a figure which shows the electric power feeding structure of the lamp | ramp in Example 1 of this invention. It is a fragmentary sectional view which shows the manufacturing process of the electric power feeding structure of the lamp | ramp in Example 1 of this invention. It is a figure which shows the electric power feeding structure of the lamp | ramp in Example 2 of this invention. It is a figure which shows the electric power feeding structure of the lamp | ramp in Example 3 of this invention. It is a figure which shows the electric power feeding structure of the conventional lamp | ramp. It is a fragmentary sectional view which shows the manufacturing process of the electric power feeding structure of the conventional lamp | ramp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Lead wire 3 Base holding part 4 Base holding part end 5 Silver solder 6 Adhesive 7 Inside of base 8 Melting tank 9 Electrode
10 arc tube
11 Lead wire end
12 Lead bar
13 Metal foil
14 Sealed tube
15 Engagement step
16 Base holding part
17 Positioning engagement part
18 Base ring
19 Base ring
20 Base ring

Claims (3)

In a power feeding structure of a lamp comprising a lead wire that feeds an electrode disposed inside an arc tube and a base connected to the lead wire, the base and the lead wire are provided at an end of the base. An electric supply structure for a lamp , wherein an injection tank for pouring a connecting material to be connected is provided , and the injection tank is a base ring that engages with an engaging portion provided at an end of the base . The lamp feeding structure according to claim 1, wherein the base ring is provided with a positioning engagement portion for mounting the lamp. Engage the base ring with the engaging part provided at the end of the base, pour the connection material into the base ring, and connect the lead wire that feeds power to the electrode arranged inside the arc tube and the base A method for manufacturing a lamp feeding structure, comprising:

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