JPH0286040A - Small discharge lamp - Google Patents

Abstract

PURPOSE:To sharply reduce the cost by only folding part of an anode lead wire to form an anode, locating the anode between a cathode and a stem, and making the anode lead wire and a cathode lead wire equal in length. CONSTITUTION:An anode 7 is arranged between a cathode 9 and a stem glass 6, the stem structure is simplified, and the whole length L2 of a light emitting tube 11 is made short to the extent possible. An anode lead wire 7b and a cathode lead wire 8b are made equal in length, and the anode lead wire is arranged at a specific distance apart from the straight line connecting two lead wires of the cathode lead wire 8b. The anode 7 is formed by only folding nearly the center of the anode lead wire, and the cathode 9 and the anode 7 are prevented from being overlapped on the same center line. The stable quality is secured, and the cost can be sharply reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to small discharge lamps in which the anode and cathode are arranged at a short distance, and in particular to the construction of the anode in this type of lamp.

[Prior Art] Conventional lamps of this type are small discharge lamps in which an anode and a cathode are arranged at a short distance, as shown in Japanese Patent Application Laid-Open No. 58-42158 and Japanese Utility Model Application No. 57-180967.
The anode is longer than the length of the line holding the cathode, and the anode is usually located closer to the top of the lamp bulb than the cathode, rather than between the cathode and the rim or base. Met.

Furthermore, the anode is usually constructed by adding an anode electrode to an anode lead wire.

In addition, in USP 3,243,632, an anode plate with an extremely large area is used as an anode.3 [Problem to be solved by the invention] 43!1 In the above-mentioned conventional method, it costs a lot of material and 11 man-hours to form an anode. The drawback was that the lamp cost was very high.

Furthermore, since the anode is located on the top side of the lamp bulb, it also has the disadvantage that the overall length of the lamp becomes long.

In view of the above-mentioned drawbacks, an object of the present invention is to provide a small-sized discharge lamp that requires less manufacturing cost for the anode and allows the overall length of the lamp to be reduced.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, the anode is configured by simply bending the anode lead wire.

Furthermore, preferred embodiments of the present invention are as follows.

(1) The anode is arranged on the top side of the lamp bulb and has a length of about 100 mL, and the anode lead wire is bent in a subsequent process.

(3) The anode lead wire is arranged at a position shifted from the cathode lead wire.

(4) Constructed by covering the anode lead wire with a metal pipe.

(5) Wind the coil around the anode lead wire.

(6) The cathode lead wire is folded back.

(7) To reduce anode loss, coat the anode lead wire with carbon or the like and stick it tightly.

(8) Regulate the anode position to prevent blackening with the minimum overall length of the lamp.

[Function] In the present invention, since the anode can be constructed by simply bending the tip of the anode lead wire, the cost for producing the anode can be significantly reduced. Furthermore, it is determined by the position of the pole according to the present invention that it is possible to manufacture a compact lamp with a small overall length.

Te (2) The anode having the same length as the cathode is easy to manufacture when forming the sudam, and the anode can be formed by only bending, making the manufacturing work easier.

(3) Since the positions of the cathode and anode are slightly shifted, the two do not collide on the central axis of the lamp, making it easier to process the anode.

(4) By adding a metal pipe to the anode, the temperature of the anode can be easily lowered.

(5) If (4) is improved by winding a coil around the anode, the anode loss will be significantly reduced several times or more, and the blackening due to evaporation of the anode will be reduced by lowering the temperature of the anode. can.

(8) By regulating the anode position, when the lamp is first used, blackening progresses closer to the end of the sealing part than in the center of the lamp, and the temperature at the end of the sealing part rises, and then at the end of the lamp's life, it is closer to the top of the lamp. Since the parts can be blackened, the parts from which light is emitted from the lamp will not turn black at the end of its life, so the working characteristics of the lamp will be extremely good.

Examples] Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1(a) to 1(Q) are diagrams showing the basic configuration of a small discharge lamp according to the present invention. The lamp pulp 1 and the mount 2 are sealed by glass welding in the sealing part 3 in the same way as a general fluorescent lamp, and then the inside of the bulb 1 is exhausted through an exhaust pipe (not shown) and a rare gas such as Ar is evacuated. 24. Mercury 5 is sealed to constitute an arc tube 11tt.

The mount 2 has a glass stem 6, an anode 7. The cathode 9 is attached to the stem 10 with which the cathode lead wire 8b is integrated, and a 7 a r 8 a denotes an anode external lead wire and an @fuku external lead wire, respectively.

In the mount 2, the anode 7 is formed by bending the anode lead 17b shown in FIGS. 3(a) to 3(Q) as shown in FIG. The cathode 9 is a filament made of a thin tungsten coil, etc., whose surface is coated with a thermoelectron emitting material, and both ends of the anode 9 are caulked with the ends of the anode lead wire 8, and installed. On the other hand, in the conventional anode, the anode fully bent or the like is attached to the anode lead wire 7b by welding, which has the problem of increasing manufacturing man-hours and increasing the price of the lamp.

In the case of this embodiment, it is only necessary to partially bend the anode lead m7b, which greatly reduces the number of manufacturing steps and reduces the lamp price.

An example of the dimensions of each part of the embodiment shown in FIGS. 1(a) to 1(c) is as follows. L2 Doo 201III, L2 Kawa 43 control.

A″: 16mo+, B without 5mm, E=0.6mm7
Figure 2 shows a lamp 12 assembled using the arc tube shown in Figure 1.
It also shows the power supply 132 lighting circuit, etc. AC voltage is applied from the power supply terminal 13, and the capacitor ballast 14. The positive side of the DC voltage is connected to the cap top 16 and the negative side to the cap shell 17 via the rectifier 15, respectively. In the lamp 12, the starter 18, which is a nonlinear semiconductor, becomes conductive, and current flows in the order of the starter 18 → cathode 9 → base shell 17. Immediately after the cathode is heated and electrons are easily emitted, the resistance value of the starter 18 decreases. The current is interrupted to increase, and at this moment the cathode 9 and the anode 7
Discharge begins during this period, leading to normal lighting.

Since the anode lead wires are placed in separate locations, the cathode 9 and anode 7 do not overlap on the same center line by simply bending the anode lead wire approximately at the center, as shown in FIG. Since the cathode lead wire 8b and the anode do not come into contact with each other, stable quality can be ensured. The appropriate distance between the anode 7 and the cathode 9 is 0.5 to 8111I.

Further, according to detailed experiments conducted by the inventors, when the outer surface area of the metal corresponding to the length B of the anode in FIG. If lamp blackening is likely to occur, the total length L8 of the arc tube 11 can be made as short as possible.

In addition, in this embodiment, as shown in FIG. 3, the anode lead wire 7b and the cathode lead wire 8b are configured to have the same length, making it easy to manufacture the stem 10 and reducing the material cost. 6 Furthermore, as shown in FIG. 3, 2 of the cathode lead wire 8b
It has been found from various experiments that the relationship between the distance c from the straight line connecting the lead wires of the book needs to be as follows: S≧25 steps... (1).

By the way, in the embodiment shown in FIG. 1, IL: 0.3A.

S=9.4 mm'', and formula (1) is satisfied.

Furthermore, in order to ensure stable performance and use the anode at low temperatures, various methods of configuring the anode can be considered, as shown in FIGS. 4(a) to 4(d).

The figure (a) shows the metal pipe 1 from above the anode lead wire 7b.
9 is covered and fixed with the caulking part 20 to achieve a discharge effect.For example, the inner diameter is 1a+m and the length is 4m.
A nickel pipe with a thickness Q of about 1 mm is suitable.

In the same figure (b), the anode lead wire 7b is
A metal plate 22 of approximately 6 mm x t 0.1 mm is welded and fixed.

It is also possible to construct the anode as shown in FIG. 4(c) in which a thin coil 21 made of tungsten or the like is wound on the surface of the anode.

Furthermore, as shown in FIG. 4(d), the anode lead wire 7b
Another effective structure is to increase the heat dissipation area by folding the cover twice.

By the way, the reason why the temperature of the anode 7 rises during lamp lighting is that when the electron flow accompanying the lamp current concentrates and flows into the anode 7, a power loss called anode loss occurs on the anode surface Φ. In order to balance the heat dissipation and increase the temperature rise value, 5 clauses 0.17N0
．． 2 for nickel, the effect shown in Figure 5, E =
The use of the coating metal 7' of copper having an ε value of 0.4 to 0.6 or carbon having an ε value of 1.0 has a great effect in lowering the anode temperature.

In addition, in order to cause blackening of the lamp to occur in places that are relatively difficult for lamp users to notice and to reduce light interruption, this purpose can be achieved by making L□ and L2 satisfy the following relationship in the configuration shown in Figure 6. It can be achieved.

It goes without saying that it is also possible to construct the lamp by coating the inner surface of the lamp bulb with a phosphor, or by constructing the lamp bulb using ultraviolet-transparent glass without coating the phosphor. do not have.

[Effects of the Invention] According to the present invention, the anode can be formed by simply bending a part of the anode lead wire 7b, and the number of manufacturing steps can be significantly reduced.

Further, since the anode 7 is located between the cathode 9 and the stem, the mounting structure is easy to manufacture, and the overall length of the lamp can be made extremely small.

Furthermore, by making the anode lead wire the same as the cathode lead wire, the stem can be easily manufactured and the material cost can be reduced.

In addition, the anode temperature in the mount structure shown in Fig. 1 is approximately 800°C when the lamp rated current is 0.3A, but
In the case of figures (a), (b), and (c).

The temperature can be lowered to about 560°C. Figure 4(d) is approximately 6
The temperature drops to about 00°C. For this reason, the blackening of the arc tube due to wk polar evaporation in Figures 4(a) to (d) is much less than that in Figure 1, and the same is true for blackening when the power supply voltage is increased. I can say that.

[Brief explanation of drawings]

Figures 1 (a) to (c) are mounting diagrams showing the configuration of a small discharge lamp according to the present invention, Figure 2 is a diagram showing the lamp structure and lighting circuit, and Figures 3 (a) to (c) are anodes. Fig. 4 is a stem diagram showing the positional relationship between the lead wire for the cathode and the lead wire for the cathode.
, ) to (d) are diagrams showing an example of the structure of the anode, FIG. 5 is a diagram showing an example of the anode with reduced emissivity, and FIG. 6 is a diagram showing the relationship between the position of the anode and the total length of the lamp. 1... Lamp bulb, 2... Mount, 3... Sealing part. 4... Rare gas, 5... Mercury, 6... Stem glass, 7... Anode, 7a... External lead wire for anode, 7b
... Lead wire for anode, 8a... External lead wire for cathode, 8b... Lead wire for cathode 59... Cathode, 10...
・Stem, 11... Luminous tube, 12... Lamp, 13
...Power supply, 14...Capacitor ballast, 15...
・Rectifier, 16...Base top, 17...Base shell, 18...Starter, 19...Metal pipe, 20・
...Caulking part, 21...Coil, 22...Metal plate. Accumulated J Immediately $d Times 22-11 Amazing Leaky Root/?・-・Stark 4th rotation easy f diagram

Claims (1)

[Scope of Claims] 1. A small discharge lamp in which an anode and a cathode are installed at a short distance, including a lead wire for connecting and holding the cathode and a lead wire for the anode, and a tip portion of the lead wire for the anode is bent. A small discharge lamp characterized in that an anode is arranged parallel to the cathode. 2. The small discharge lamp according to claim 1, wherein the anode is disposed between the cathode and the stem. 3. The small discharge lamp according to claim 1, wherein the anode lead wire has the same length as the cathode connecting lead wire before being bent. 4. The small discharge lamp according to claim 1, wherein the base of the anode lead wire is located a little farther from a straight line connecting the two cathode connecting lead wires. . 5. Cover a part of the above anode lead wire with a thin metal cylindrical pipe and fix it by caulking to form an anode, or
Alternatively, by means of increasing the surface area by welding and fixing the metal plate, the lamp rated current I_L (A) and the area S (mm^2 ) The small discharge lamp according to claim 1, characterized in that the relationship between S≧25I_L. 6. A small discharge lamp according to claim 5, characterized in that a coil made of tungsten or the like for use in light bulbs is wound around the surface of the anode as the surface area increasing means. 7. The small discharge lamp according to claim 5, wherein the surface area increasing means is made of a long anode lead wire and its tip is folded back several times to increase heat dissipation efficiency. 8. Claim 1, wherein at least the surface of the anode is made of copper, or carbon is adhered to the surface of the anode, so that the emissivity of the surface is 0.3 or more. The small discharge lamp described. 9. The relationship between the distance L_1 from the part of the anode parallel to the cathode part to the end of the lamp sealing part and the lamp arc tube total length L_2 is (L_2/2)-5≦L_1≦(L_2/2)+2. A small discharge lamp according to claim 1, characterized in that: