JPS607346B2 - metal vapor discharge lamp - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a metal vapor discharge lamp having a main electrode at both ends of an arc tube bulb made of an alumina ceramic tube and an auxiliary starting electrode on the outer periphery of the arc tube bulb. For example, a high-pressure sodium lamp is constructed by sealing both ends of an arc tube bulb made of alumina ceramic with caps made of niobium, tantalum, etc., and attaching main electrodes to each of these caps. is enclosed. In addition, in the past, 10 to 2 orr of xenon was sealed in the bulb as a starting gas, but although this xenon improved lamp efficiency, the starting voltage was 15 orr.
00 to 2500V, and therefore, in order to use it with a normal 200V power supply, a starter device that generates a high voltage pulse is required. However, this starting device is not only expensive, but also has various troublesome drawbacks, such as generation of noise due to pulses, restrictions on lamp wiring length, and safety during lamp replacement. For this reason, recently, a mixture of neon and argon or neon and krypton, which has a large Bennincou effect, is used as a starting gas, and a mixture of neon and argon or neon and krypton, which has a large Bennincou effect, is used, and the gas is placed near the outer circumference of the arc tube bulb at room temperature. A lamp has been proposed that is provided with a capacitive starting auxiliary electrode made of a thermally deformable conductor that separates from the bulb when the bulb temperature rises after lighting. However, in the lamp according to this proposal, the starting voltage is 18
In order to obtain a starting voltage of 0Vt (preferably 160V or less) without variation, it is necessary to increase the area of the starting auxiliary electrode near the arc tube bulb, and for this reason, the outer circumference of the bulb is covered by this auxiliary electrode. However, there is a disadvantage that the light emitted from the arc tube bulb is blocked and the amount of light is reduced. In addition, the auxiliary electrode attracts sodium ions while the lamp is lit, and these sodium ions react with alumina, causing blackening. After startup, the auxiliary electrode receives heat from the bulb and deforms and becomes separated from the bulb. However, even this method was unable to reduce the blocking of synchrotron radiation and was forced to reduce the amount of light.This invention was made based on these circumstances, and its purpose is to Not only is the auxiliary electrode made of bimetal, but its tip faces the arc tube bulb during startup to facilitate starting, and when stable after starting, the heat of the arc tube causes it to move in a direction approximately perpendicular to the bulb axis. It is an object of the present invention to provide a metal vapor discharge lamp which is formed so as to be rubbed and deformed so as to increase the amount of light that interferes with the reflection of light.An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. The drawings show a high pressure sodium lamp rated at 400W, with 1
2 shows an outer tube, 2 a cap attached to one end of the outer tube turtle, and 3 an eyelet terminal provided on the cap 2. A stem 4 is sealed at one end inside the outer tube 1, and an internal lead wire 5a95b connected to the square metal 2 and the eyelet terminal 3 is sealed around this stem.
Conductive supports 8a and 6b are welded to these internal lead wires 5a and 5b, respectively, and one support 6a extends inside the outer tube 1 toward the end of the outer tube 1.
The ball is landed in a small depression formed at the tip of the ball through elastic plates 7, 7. Further, conductive wire holders 8, 8 are fixed to these supports 8a, 6b, respectively. In this case, one end of one holder holder G is electrically connected to the other support 6b, and the other end is supported by one support 6a via an insulating tube 9. And these holders 8,
A light emitting tube 0 is spanned between the crabs. The openings at both ends of the arc tube bulb made of alumina ceramic are closed with cap blades 29 made of niobium, titanium, etc., and the main electrodes 13a and 13b are attached to these cap blades 29 and 2, respectively. The main electrodes 3a, 13b' are electrically connected to the supports 6a, 6M via the holders 8, 8. ``Approximately 2 P of neon mixed with a predetermined amount of mercury and sodium as luminescent metals and 0.5% argon as a starting gas.
It is sealed at a pressure of rr. Also, such a luminous tube turtle 0
An auxiliary starting electrode 14 is provided on the outer periphery of the starter. That is, the turtle 5 is a conductive support rod whose center is welded to one support 6a so as to intersect with the steel wire, and the bases of bimetal turtles 6716 are welded to both ends of the support 5, respectively. There is. The base ends of these bimetal turtles 6 and 37' are arranged in a direction that intersects the support rod 15 with the support 6a. The bimetal 16 and the turtle 6 are bent at almost right angles in the middle, so that the curved line 89 is more than a turtle flea. Tip side -9
, Military 95 is along the tube axis of the valve officer I. These front end side turtles 9 and 19 are supported or close to the outer peripheral surface of the valve turtle 1 and are curved along the outer peripheral surface. It should be noted that the surface of these bimetal nobles 6 and 16 facing the valve head 1' forms the high expansion side. However, in the lamp of the embodiment with such a configuration, when the lamp is turned off, the starting auxiliary electrode 14, that is, the bimetal turtle 6, the tip of the neck 6

[9
, The neck 9 is in contact with or close to the outer surface of the arc tube bulb 1, and when electricity is started in this state, the bimetallic state 6
, Since the turtle and mouse have the same polarity as the one main electrode 13a, a discharge is started between the other main electrode turtle 3b and the bimetal group 6, group 6, and this discharge grows between the main electrodes 13a and 13b. In this case, since a mixture of neon and argon is filled as a starting gas in the arc tube bulb 11, the synergistic effect of the neon and argon makes it possible to start with an extremely low voltage. For example, in the case of a 400W rated lamp, it will start even at a voltage of about 160V.Next, when the discharge stabilizes, the temperature of the arc tube bulb rises, and this heat heats the bimetal roof 16. Tatami Take 9 The high expansion side of Kame 61 is facing the valve part, so the tip side Tomai 8 Kame period In this case, the thinly curved part along the outer circumferential surface of the valve part is almost flat. It extends and separates from the valve socket. Also, the proximal end 1
7. Tear curve 18,1 between wing y and tip silkworm 9,19
At section 8, the heat from the valve head 1 cancels this false bending and deforms in the direction of returning to its original state.As a result, the bimetal 16 and the blade 6 are deformed as shown by imaginary lines in Figures 2 to 4. The bimetals 16, 16 are separated from the bulb 11, and the sodium ions are released into the bimetal 1.
6 and 16 will no longer occur, and blackening due to the reaction between sodium ions and alumina will no longer occur. Moreover, when the bimetals 16, 16 are thermally deformed in this way, the bimetal turtles S, 16 are positioned perpendicular to the bulb 1, so they are less likely to block the light emitted from the bulb 11, and L increases the amount of light. At the very least, it becomes possible to improve light efficiency. Also, in this case, the bimetal content is 6,
16 is moved away from the valve il, thermal deterioration of the bimetal 16 and the turtle 6 is reduced, resulting in a longer life. Next, an experimental example of the high pressure sodium lamp according to the above embodiment will be explained. In a 400W high-pressure sodium lamp using an arc tube made of an alumina ceramic tube with a total length of 114 mm on the inner diameter side of 4.8 mm, when a bimetal piece of the starting auxiliary electrode with a dimension of 8 ribs along the bulb axis direction is used. The conventional structure in which the bimetal piece does not undergo deformation has a total length of 40,000 som, whereas the total length of the present invention in which the bimetal piece is rubbed and deformed has a total length of 41,600 som.
An improvement of 4% was observed in Zenkōdō. The starting voltage and blackening during life were both good without any problems. In addition, the dimensions of the bimetal turtle 6 and neck 6 along the valve axis direction,
In other words, the width 1 is preferably 3 to 5 ribs, and more preferably 3 to 2 ribs. If this width L is less than 3 sides, the function as an auxiliary pole for starting will be reduced and the starting voltage will be high, and if it exceeds 5 sides, it will be difficult to bend the bimetal turtles 6 and 6 as described above. becomes. From the viewpoint of ease of bending, it is preferable to have about two ribs. Further, the present invention is not limited to the above configuration, but may be configured as shown in FIGS. 5 and 6. In other words, in this case, one support 6a is extended and connected to the other support 6b via an electrically insulating tube 20, and "support lines 21 and 22 provided at mutually opposing portions of one support 6a are connected to each other." Bimetals 23, 24 are attached as auxiliary electrodes for starting, and each bimetal 23, 24 is bent in the same manner as in the first embodiment.Furthermore, neon and The present invention is not limited to a mixed gas with argon, but can also be performed with a mixed gas of neon and xenon, neon and krypton, or a mixture of neon and multiple types of argon, xenon, and krypton.As explained above, according to the present invention, , the starting auxiliary electrode is constructed such that its tip faces the arc tube bulb and its proximal end rubs approximately 90 degrees against this tip. Since the auxiliary electrode is thermally deformed so that it is approximately orthogonal, the tip of the auxiliary electrode with a predetermined plane follows the direction of the light emitted from the bulb, so this light is no longer blocked, and the amount of light is increased. In addition, this auxiliary electrode separates from the bulb due to thermal deformation, which eliminates the cause of blackening caused by suction of luminescent metal, and reduces thermal deterioration, resulting in a longer life. Furthermore, since the auxiliary electrode only needs to be formed by bending a bimetal or the like, the configuration is simple.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of the present invention, and the first
2 is a side view of the main part, FIG. 3 is a sectional view, FIG. 4 is a perspective view of the bimetal, and FIGS. 5 and 6 show other embodiments of the present invention. 5 is a side view of the whole, and FIG. 6 is a sectional view of the main part. 1... Outer tube "6a, 6b... Support, 10... Arc tube, No. 1... Arc tube bulb" 13a, Tortoise 3b... Main electrode, 14... Auxiliary electrode for starting, Tortoise 6, 21, 22 ...Support line also Hiroshi 6, 16, 23, 24...Bit tart wing completed...Base end of bimetal, 18...Tear curve, 18...Tip of bimetal. Fig. 1 Fig. 2 Fig. 3 Fig. 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. A starting gas consisting mainly of a luminescent metal and neon mixed with at least one of argon, krypton, and xenon is filled in an arc tube bulb made of an alumina ceramic tube, and one main electrode is placed on the outer periphery of the arc tube bulb. A capacitive starting auxiliary electrode is provided that is electrically connected to the bulb and is close to the bulb at room temperature to facilitate starting, and when the bulb is turned on, it is deformed by the heat from the bulb and moves away from the bulb. The auxiliary electrode has a distal end facing the bulb, and a proximal end twisted approximately 90 degrees with the distal end and fixed to the mount member, and when lighting, the distal end faces the bulb axis in a direction substantially perpendicular to the bulb axis. A metal vapor discharge lamp characterized in that it is thermally deformed.