JPS58142753A - High pressure discharge lamp - Google Patents

Abstract

PURPOSE:To prevent the dielectric breakdown of a stabilizer or the like by decreasing the starting voltage of main discharge and absorbing the surge liable to occur at the end of its life. CONSTITUTION:An auxiliary electrode 41 consisting of tungusten wires penetrates into a protective tube 42 made of a cylinder of alumina porcelain and the protective tube 42 penetrates into a disk 3b at the end of a luminous tube 1. A sealing agent 43 which exhibits its bonding function by partially fusing crystallized glass seals airtightly the sections between the auxiliary electrode 41 and protective tube 42 and between the protective tube 42 and disk 3b in the same way as between a cylindrical body 2 and disks 3a, 3b and between the disks 3a, 3b and electrode leads 4a, 4b. Then the auxiliary electrode 41 is connected to a support frame 7a through a resistor body 44 of approximately 5.5kOMEGA and a bimetal switch 45 used for the auxiliary electrode and has the same potential as the main electrode 5a. On the other hand, a bimetal switch 13 for a starting auxiliary body is fixed to a support frame 7b so that a starting auxiliary body 12 can have the same potential as the main electrode 5b at the side of the auxiliary electrode 41.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to an improvement in the high pressure number jlt +1, and in particular to starting characteristics.

For convenience of explanation, we will take a 90W high-pressure sodium lamp as an example.High-pressure sodium lamps are in high demand because of their high efficiency during high-pressure discharge. Figure 1 shows an example of this 90W high-pressure sodium lamp.
explain. (1) is a translucent alumina porcelain cylinder (2)
, an alumina porcelain circle FIN that closes both ends: (3
a), (3b), this disk (3a), (5b
) f Penetrating electrode lead (4a), (+ to 4)
.

Main electrodes (5a), (5b) attached to the inner tips of electrode leads (4a), (4b), inner FQI
It is an arc tube consisting of an appropriate amount of sodium and mercury amalgam sealed in 300 Hg and 71 Hg of xenon.

The arc tube (11 is welded to the lead plate (6a), (6b) at the row side tip of the electrode lead (4a), (4b), and the lead machine (6a), (6b) is welded to the support wire (7a).
, (7b) and welded to the support wire (7a).

(7b) Stem lead (10a) passing through the stem (9) sealed in the outer tube (8) made of ll-j Niglass
, (10b) and are eventually fixed within the outer tube (8). A plate spring O1l is welded to the upper part of the support wire (7a), and the plate spring <II) pushes one end of the outer tube (8), further ensuring the fixation of the arc tube (1).

In addition, a starting aid (I) made of tungsten wire with a diameter of 0.3 mm is tightly wound around the outer wall of the 9 arc tube (1), and both ends are insulated with supports (20a) and (20b). It is insulated and supported via tubes (21a) and (21b) and fixed at (7a).When starting, the starting aid 02 is supported via a starting aid bimetal switch α:1. ) In other words, it is made to have the same potential as the main electrode (5a), so that after the switch 9 is lit, the bimetallic switch 03 for the starting aid opens, and the starting aid α becomes electrically floating. .

Also, between the starters there is a support wire 01) between the support wires < (
71)). Before lighting, starter (7)
is support line < (7b) - support line 01) - identification contact stand a
J - Fixed contact (C) - Movable contact (F) - Bimetal (C) - Bimetal stand C Filament 0 which is the lower limit current resistance
7) - Filament fixing equipment - Lead wire 0 - Support
They are electrically connected in the order shown in (7a), and the fixed contacts (to) and movable contacts (mains) are all welded and then assembled and fixed to the starter frame 4 made of alumina porcelain. In the end, the bimetal C, contact (2), and H, which are thermally responsive switches, and the filament, which is a resistor,
A circuit in which C171 is connected in series is connected to the arc tube (1). The above is installed inside the outer tube (8), but the stem lead (10a) is also installed inside the outer tube (8).

(10b) is connected, and power is supplied from the outside through this base α71.

This lamp works as follows. When connected to the power supply via the 100W mercury lamp ballast, the main electrode (5a),
(5b) Since no discharge occurs, current flows through the thermally responsive switch and the filament r3η.

The filament (371 heat eventually turns into a bimetal (
C) is deformed, the gap between the fixed contact (G) and the movable contact 04) opens, and the current is cut off, causing a surge. This surge is applied between the main electrodes (5a) and (5b), or between the starting auxiliary body α2 and the main electrode (5b), and discharge starts. After the discharge starts, the temperature of the lamp often rises due to the heat of the discharge between the main electrodes (5a) and (5b), and as a result, the IJum and mercury in the arc tube evaporate, and the high-pressure fume containing mercury and xenon evaporates. Transition to atmospheric sodium discharge, 5
It will become stable in about a minute 1, and due to the heat of this discharge,
The bimetallic switch α4 for the starting aid opens, making it possible to prevent sodium loss due to the potential of the starting aid. Also.

This heat opens the thermal switch of the starter Cl, which prevents current from flowing through the starting circuit.

In this way, such lamps that require a high starting voltage can be operated using a normal mercury lamp ballast.

By the way, the discharge starting voltage of this lamp is 3 when starting normally.
KV to 4 xv, and near the end of life, 4
KV to 7 KV. Therefore, until the end of its life, a high voltage of at least 3 KV to 7 KV is required each time it is started, and all of this is generated using the above-mentioned starter.

This high voltage can cause insulation breakdown in ballasts, wiring, and lighting equipment. This essentially shortens the lifespan of the ballast, etc., which is a major drawback.

The present invention has been made in view of these drawbacks, and includes providing a starter and an auxiliary electrode in the vicinity of the auxiliary electrode in the vicinity of the main chamber, and connects the auxiliary electrode to the other main electrode through at least a resistor. By connecting the lamp to the lamp, the high voltage at startup is reduced and the life of the ballast is not shortened.

The following will be explained using FIG. 2, which is an embodiment of the present invention, and FIG. 3, which is an enlarged sectional view of the vicinity of the main electrode.

explain in detail.

(41) tj: An auxiliary electrode made of a tungsten wire with a diameter of 0.3 m and a protective tube (4
21, and the protection v (42) is the arc tube (1
It passes through the disk (6b) at the end of 1. Auxiliary electrode (4
1) and protection tube (42, protection tube (・12) and disk (3b)
Between the cylinder (2) and the disk (3a) I (3b),
Circle ml (3a), (3b) and electrode lead (4a)
, (4b), they are airtightly sealed using a sealing agent 03) that melts and adheres partially crystallized glass. And auxiliary MX 4W (, III, about 55
The KO resistor (44) and the auxiliary electrode bimetal switch (451) are connected to the support plate (7a) and at the same potential as the main electrode (5a).
1)) and the auxiliary room'W! (The distance from Shun is about I FIm. On the other hand.

The starting auxiliary body H is connected to the auxiliary electrode (main electrode (5b) on the side with 40
) The bimetallic switch 0 (6) for the starting aid was fixed to the support arm (7b) so that the potential was the same as that of (7b).

The structure other than the above is the same as that of the conventional example.

This lamp operates in a first-order manner during startup.

When connected to the power supply 7Ilii through the ballast, the main electrode (
5a) and (5b) between the main electrode (5b) and the auxiliary '1
．． 4Th, (41), there is no discharge, and current flows through the thermally responsive switch made of filament On and bimetal (c), and the thermally responsive switch eventually opens as in the conventional example.

A surge occurs. With this surge, first, the main electrode (5b)
And the auxiliary room! (41) occurs, and the charged particles of this discharge lower the discharge starting voltage between the main mold poles (5a) l (5b), so that a discharge subsequently occurs between the main electrodes.

After this discharge starts, it operates and starts in the same way as the conventional example. Furthermore, during lighting, the bimetal switch for the auxiliary electrode opens due to the heat of the arc tube, and no potential is applied to the auxiliary electrode1. In this lamp, the starting voltage of the auxiliary discharge is approximately 900.
(2) Even at the end of its life, the voltage remained below 1.5 KV. On the other hand, the starting voltage of the main discharge is the auxiliary discharge VC as described above.
Therefore, the voltage was lower than 4 KV even though the life was not reached at about 1.5 KV to 2 KV. It was a long time ago. The lifespan is reached,
Even in a lamp where a main discharge has stopped occurring, after an auxiliary discharge is started due to a surge, the energy of the surge is consumed through the 5.5Ω resistor (44), so the surge does not rise above about 4KV. In other words, in this rung, since a surge of about 4 KV or more does not occur in the trench at the end of its life from the beginning, it was possible to prevent dielectric breakdown of the ballast, wiring, and lighting equipment, resulting in VC<<, and shortening of the life.

The starting voltage of the auxiliary discharge is considerably lower than the starting voltage between the main electrode (6a) and the auxiliary electrode (because the distance between them is small). The reason for this is that the starting voltage of 1 M is not higher than that of the conventional example. It was determined that the main cause was that the starting aid became ineffective due to the effect of the starting aid.For this reason, it is estimated that the 11E start of discharge of the auxiliary electrode and the main electrode, where the starting aid has no effect, will not change much even after the end of its life. However, it was true.

In addition, when the resistance value of the resistor (44) was changed in various ways for important reasons, it was found that if it exceeds 1ooKO, the auxiliary discharge current becomes too small and the ME pressure at the start of the main discharge does not decrease, so high voltage surges occur. is required, and if it is below KO, after the auxiliary discharge occurs.

The energy consumption of the surge was large, and the surge did not become large due to the change in the starting voltage of the main discharge, so it did not move to the main discharge. In addition, when Ω or more exceeds 12Ω, it has the effect of reducing the starting voltage of the 10s, but the life is premature and the starting voltage of the main 1s becomes constantly high. After that, the current is a little high, so the energy consumption of the surge is too small.

A large surge was generated, which could cause dielectric breakdown of the ballast. Therefore, the resistance value of the resistor changes from 4KO1 to 1
It is preferable that the distance be in the range of 2 KO. Note that the smaller the distance between the auxiliary electrode and the main electrode (5b), the easier it is to start a discharge, so it is preferable. However, the starting voltage of the auxiliary discharge is not as important as the starting voltage of the main discharge, and although we have manufactured lamps in the range of 5 tnm since 2003, the starting voltage of the auxiliary discharge is still low even at the end of its life. 2K
V or less.

The problems were quite extensive. In addition, when this distance was further increased by using a lamp whose structure was experimentally changed, it reached 4KV in about 15 battles.

I found out that it's good if it's 15 fights or less.

In this example, a 90W high-pressure sodium lamp was used, but the power is not limited to this, and the lamp can be applied to other high-pressure discharge lamps3.Also, in this example, a starting aid was provided. However, it does not have to be wound around the arc tube like this; other methods, such as applying a metal wire parallel to the arc tube axis, may also be used. However, it is effective to some extent, and depending on the situation, it may not be necessary.

As described above, in this invention, the starting circuit is connected in parallel with the arc tube, and the auxiliary electrode (+
: By connecting it to the other main electrode through a resistor, it lowers the starting voltage of the main discharge, and also absorbs surges at the end of the service life, thereby preventing insulation breakdown of ballasts, etc. Thus, a practically excellent high pressure discharge lamp can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional high-pressure discharge lamp, FIG. 2 is a diagram showing an embodiment of the present invention, and FIG. 3 is an enlarged cross-section of the main part shown in FIG. 2. In the figure, (1) is arc tube + (5a) + (”i
)) is the main type (11) pole, (8) is the outer tube, 0■ is the bimetal, c3n is the filament), (4]) is the auxiliary electrode, (114+ is the resistor. Agent Shin Kuzuno - ( 12) Ne z2, *3 Figure

Claims (4)

[Claims] (1) A pair of main electrodes housed inside an arc tube into which rare gas is inserted, and an auxiliary 'Q7\4 pole placed close to at least one of the pair of main electrodes. A sieve discharge lamp comprising: a resistor provided between the auxiliary electrode and the other main electrode of the pair of main electrodes; and a starting circuit connected in parallel to the arc tube. (2) The high pressure discharge lamp according to claim (1), wherein the starting circuit comprises a thermally responsive switch and a current limiting resistor connected in series with the thermally responsive switch. (3) The resistor provided between the auxiliary electrode and the piezoelectric element is characterized in that the resistor is within 4 Ω-12 λ. The high-pressure discharge lamp described in (2). (4) Claim No. 1, characterized in that the arc tube is filled with sodium and mercury in addition to the fan gas.
The high-pressure discharge lamp according to any one of paragraphs (+) to (3).