JPS5830061A - Metal vapor discharge lamp - Google Patents

Abstract

PURPOSE:To enable a limit resistance to be minimized in its size and obtain a metal vapor-discharge lamp to be lighted by means of a stabilizer for a mercury- arc lamp. CONSTITUTION:In a luminous tube 2 contained in an outer tube 1, there are a pair of main electrodes 3a and 3b and a starting auxiliary electrode 4 adjacent to one main electrode 3a. In the outer tube 1, a starting circuit composed of a resistor 5, a glow-starter 6, and a usual-closed heat-responding switch 7 is connected, in parallel, to the luminous tube 2. And the starting auxiliary electrode 4 is connected to a node of the resistors and the glow-starter 6 as an impedance. Since the current of the glow-starter 6 flows through not only the resistor 5, hot also the main electrode 3a and the by-pass circuit of the starting auxiliary electrode 4, the capacity of the resistor 5 can be minimized and a small-sized can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a metal vapor discharge lamp which can be operated with a mercury lamp ballast.

Chikamaki, high pressure sodium lamp and Metal I Ride Run!
Most high-efficiency external metal vapor discharge lamps are lit using low-voltage ballasts for mercury lamps.Since these high-efficiency 9-type lamps have a high starting voltage, they have a starting circuit inside the outer bulb. It is designed so that it can be lit even with a mercury lamp ballast.

That is, as shown in FIG. 1, in the outer bulb J of the discharge lamp, there is an arc tube 2 provided with a pair of main electrodes Ja, Jb and an auxiliary electrode 4 for starting, and an arc tube 2 connected in parallel to the arc tube 2. The lighting tube current limiting resistor 5, the lighting tube 6 and the normally closed type response switch (
bimetal switch etc.) 1 connected in series, and the starting auxiliary electrode 4 is connected to the connection point between the lighting tube 6 and the bimetal switch 1 via a resistor 8. It is.

Such a discharge lamp is connected to a power source 10 via a mercury lamp ballast 9.
When a voltage is applied from , since the normally closed bimetal switch 2 is closed, current flows through the current limiting resistor 5, the lighting tube 6, and the bimetal switch 1, and the contacts of the lighting tube 6 open and close. Based on the opening/closing operation of the lighting tube 6, the Norse voltage is generated, so this Norse voltage is applied to the main electrode Ja.
, Jb and is applied between the starting auxiliary electrode 4 and one of the main electrodes 1 which is close to the edge, so that there is no insulation between the starting auxiliary electrode 4 and one of the main electrodes 1a. The arc tube 2 is started because the arc reaches the opposite main electrode Jb and generates an arc between the amphibious electrodes xassb. After the discharge lamp starts, when the light emission t2 generates heat,
The normally closed bimetal switch 1 is opened by this heat, and even if the rung voltage of the arc tube 2 increases, no current flows through the lighting tube circuit, thereby preventing short circuits and the like.

By the way, in a rung with such a configuration, it is desirable that the lighting tube current is normally 1 ampere or less, and if the 0 lighting tube current used exceeds 37 amperes (a), the lighting tube current 6 generates heat due to self-current, and therefore becomes normally closed, and does not operate normally and does not generate t, t+Δ pulses.

From this, the current limiting resistor J is several 100 ohms, more precisely 300 ohms.

Since such a current limiting resistor 5 consumes several tens of watts of power when the lighting tube is operated, it requires a large resistor and occupies a large surface space. For this reason, there is a space constraint to incorporate it into the outer tube 1, and especially small metal I
The configuration shown in Figure 1 was inappropriate for the I4 steam discharge lamp.

The present invention has been made based on the above circumstances, and an object of the present invention is to provide a structure that can reduce the size of the current limiting resistor and is particularly suitable for a small metal vapor discharge lamp.

An embodiment of the present invention will be described below based on FIG.

A pair of main electrodes 3* are housed inside the outer tube 1 and inside the leading light tube 2.
A starting auxiliary electrode 4 is arranged close to Ib and one main electrode 3a. Connected within the outer tube 1 in parallel with the arc tube 2 is a starting circuit consisting of a series circuit of a resistor 5, a lighting tube 6, and a normally closed response switch (/4 Imetal switch, etc.) 1.

The starting auxiliary pole 11 is connected to the connection point between the resistor 5 serving as an impedance and the lighting tube C.

That is, the main electrode Ja and the starting auxiliary electrode 4 are connected via the resistor 5, and the lighting tube 6 and the normally closed type・Resistance 6 is 2
000 ohms or less, preferably 300 to 1200 ohms, and the lighting tube σ is a glow lighting tube.

Such a discharge lamp is connected to a power source 1 via a mercury lamp ballast 9.
– is connected to. When a voltage is applied from the power supply 10, a current flows through the resistor 5, the lighting tube 6, and the normally closed type/4 Imetal switch r, and the lighting tube l is activated at the moment when the lighting tube 6 becomes conductive. A /l soot pressure is generated, and a /ll soot pressure is transmitted to the auxiliary electrode 4. This causes discharge breakdown between the gold main electrode 1a and the auxiliary electrode 4. This discharge breakdown is
After the lighting tube 6 becomes conductive, the power supply voltage is directly applied between the main electrode Ja and the auxiliary electrode 4 without any voltage drop, so that the main electrode 3a is immediately connected to the main electrode 3a.
and the auxiliary electrode 4, and this arc discharge causes the ghost-Ja and the auxiliary electrode 40 to
The secondary current of the ballast 9 flows between them. That is, at this time, current flows through the main electrode C, the auxiliary electrode 4, the lighting tube 6, and the blue metal switch 70 circuit, but almost no current flows through the resistor 5, and no power loss occurs. This allows the resistor 6 to be made smaller. Note that the current at this time is the secondary current of the ballast 9, and at this time, the secondary current also flows through the lighting tube 6. As mentioned above, since the lighting tube 6 needs to have a current of 3 amperes or less, the secondary current of the ballast 9 needs to be 3 amperes or less, so this discharge lamp uses the secondary current of the ballast. It is necessary that the lamp be a small-sized lamp that can be lit with a current of 3 amperes or less.

Subsequently, when the lighting tube 6 is cut off, a pulse voltage is generated, and based on this pulse voltage, the auxiliary arc discharge shifts to the main arc discharge between the main electrodes Ja and 3b. This round lamp is what starts it.

run! When the lamp is started, the main arc discharge within the arc tube 2 is stable and self-sustaining since the lighting tube 6 tends to operate under the action of the resistor 5 below a certain voltage.

Then, when the silanzo voltage increases due to heat generation in the arc tube 20, the piemetal switch and the chia are opened, so that the phantom tube 6 is no longer energized.

The starting auxiliary electrode 4 is connected to one of the adjacent main electrodes JaK via a resistor 5, but there is almost no potential difference during this stable lighting, and for this reason! This phenomenon prevents the quartz constituting the bulb of the arc tube 2 from cracking.

In this way, the rungs related to the configuration shown in Figure 2 are lit! The current # flows not only through the resistor 5 but also through the main electrode 3a and the starting auxiliary electrode 4.
Since the capacitance of the resistor 5 can be reduced and a small resistor can be used, the auxiliary resistor 8 unlike the conventional one is also not required, so the space inside the outer tube 1 is small. The number of parts can also be reduced. Therefore, it is particularly suitable for small discharge lamps. Further, since the auxiliary discharge is an arc discharge, there is an advantage that it is much easier to start compared to the first conventional method.

Note that the present invention is not limited to the configuration example shown in FIG. 2 above, but may also be applied to a configuration in which the auxiliary starting electrode 4 is arranged outside the arc tube 2 (also referred to as a proximal conductor), as in the modified example shown in FIG. 3. The auxiliary discharge in this case is not an arc discharge but an instantaneous corona discharge based on the potential gradient, but the starting action is the same as in the case of FIG. 2.

Further, in each embodiment, the resistor 5 may be replaced with a capacitor or an actuator, and in short, it can be implemented as long as the impedance value is 2000 ohms or less.

The present invention as described in detail above connects the starting auxiliary electrode to one adjacent main electrode via an impedance, and connects the auxiliary electrode to the other opposing main electrode via a lighting tube and a normally closed type responsive switch. Since it is connected to the main electrode, at startup, the current flowing through the lighting tube bypasses the impedance and flows through the discharge between the auxiliary electrode and one of the main %L&, so almost no current flows through the impedance.
No power loss occurs, and as a result, the impedance can be reduced in size, and it can be placed in a small space inside the outer bulb, which is particularly convenient for L-shaped discharge lamps.

Furthermore, since the conventional resistor 8 shown in FIG. 1 is not required, there is an advantage that the number of parts can be reduced.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a conventional configuration, FIG. 2 is a circuit diagram showing an embodiment of the present invention, and FIG. 3 is a circuit diagram showing a modification of the present invention. 1... Outer tube, 2... Arc tube, 3m, 3b-... Main electrode, 4... Auxiliary electrode for starting, J-... Resistance (impedance) 6... Lighting tube, 7.・・Normally closed type responsive switch, 9 ・Ballast for mercury lamp, 10 ・Power source. Applicant's agent Patent attorney Suzue Takehiko No. 1vA I -W No. 21i! Figure 3 1 L-111~-~-J

Claims (3)

[Claims] (1) An auxiliary electrode for starting is arranged inside or outside of the arc tube having a pair of main electrodes, and the auxiliary electrode for starting the skeleton and one of the main electrodes adjacent thereto are connected by impedance, and the above-mentioned starting 1. A metal vapor discharge lamp characterized in that a lighting tube and a normally closed situation-sensitive switch are used to connect an auxiliary electrode to the other opposing main electrode. (2) The metal vapor discharge lamp according to claim (1), wherein the lighting tube is a glow lighting tube and has an impedance of 20,008 or less. (3) The metal vapor discharge lamp according to claim (1) or (2), wherein the discharge lamp is lit by a ballast having a secondary short circuit current of 3 amperes or less.