JPS59850A - Starting device built-in high pressure discharge lamp - Google Patents

Abstract

PURPOSE:To perform accurate restart by setting the return time of a bimetal switch that is connected in series to a start auxiliary conductor provided on the external surface of a discharge tube shorter than the return time of the bimetal switch that is connected in series to a resistor and connected in parallel to a discharge lamp. CONSTITUTION:A start auxiliary conductor 4 is provided on the external surface of a discharge tube 1 through a bimetal switch 2 and the series body consisting of a bimetal switch 3 and a resistor 5 is connected in parallel to the discharge tube 1. These are housed in a common outer bulb 6 and are connected to a power supply 8 through conductive stabilizer 7. The resistor 5 is formed with a filament made of tungusten and is wound around and fixed to an insulating body 9. The switches 2 and 3 are also mounted on the insulating body 9. The switch 3 is arranged so as to confront a part of the resistor 5 and the switch 2 is arranged at the position slightly separated from the insulating body 9 and not to confront the resistor 5. As a result, when a discharge lamp is restarted, the switch 2 returns to the closed status earlier than the switch 3 and the discharge tube 1 can accurately be restarted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-pressure discharge lamp with a built-in starting device, particularly a metal halide discharge lamp and a high-pressure sodium lamp.

Recently, in order to improve the efficiency of high-pressure sodium lamps, high-pressure sodium lamps have been developed, which use xenon gas as the starting rare gas sealed in the arc tube and have a higher pressure than conventional lamps. However, the starting voltage of IJum lamps is high, and in order to light this with a mercury lamp ballast, a starting auxiliary circuit consisting of a bimetallic switch and a resistor in series was connected in parallel with the arc tube. and provided inside the outer sphere.

FIG. 1 shows a lighting circuit for a conventional high-pressure discharge lamp with a built-in starter of this kind. In this high-pressure discharge lamp, a starting auxiliary conductor 4 is provided on the outer surface of a discharge tube 1 via a first bimetal switch 2. In addition, a series body of a second bimetal switch 3 and a resistor 5 is connected in parallel with the discharge tube 1, and these are housed in a common outer sphere 6. When a high-pressure discharge lamp having such a configuration is connected to a power source 8 via an inductive ballast 7, current first flows through the ballast 7 to the series body of the second bimetal switch 3 and the resistor 5. The resistor 6 becomes red hot. The second bimetal switch 3 is heated by the red heat of the resistor 5 and opens for several seconds, but at that moment, the current flowing through the ballast 7 is suddenly cut off, causing the ballast 7 to receive a pulse voltage. is induced. This pulse voltage causes a starting auxiliary conductor 4 provided on the outer surface of the discharge tube 1.
With the addition of the starting assisting effect, the discharge of the discharge tube 1 starts.

However, in such a high-pressure discharge lamp with a built-in starting device, when the lamp is restarted, that is, when the power is cut off during lighting and then turned on again, the first bimetal switch 2 remains open and the second bimetal switch 2 is turned on. The second bimetal switch 3 returns to the closed state, and even if a pulse voltage is induced in the ballast 7 due to this closure, discharge does not start in the discharge tube 1, and the second bimetal switch 3 continues to open and close. A resistor 5 generally made of a tungsten filament,
There was a problem that the life of the ballast 7 was shortened. Further, there was also the problem that the light emission and blinking of the resistor 6 was repeated for a long time, giving a feeling of discomfort.

The present invention has been made in view of these problems, and an object of the present invention is to provide a high-pressure discharge lamp with a built-in starting device that can operate reliably upon restart and prevent shortening of the life of the ballast and resistor. The purpose is to

To achieve this object, the present invention provides a first starting auxiliary circuit consisting of a discharge tube, a starting auxiliary conductor provided on the outer surface of the discharge tube, and a first bimetal switch connected in parallel with the discharge tube. and has a second starting auxiliary circuit made of a series body of a resistor and a second bimetal switch inside the outer sphere, and the return time of the first bimetal switch is the return time of the second bimetal switch. It features a high-pressure discharge lamp with a built-in starting device that is set to a shorter length.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a front view of essential parts showing an example of the starting device used in the high-pressure discharge lamp with built-in starting device of the present invention, and FIG. 3 is a side view of the same.
FIG. 4 is a side view of the main parts of a high-pressure discharge lamp in which a starter device is built into the outer bulb.

In the high-pressure discharge lamp with a built-in starting device of the present invention, the electrical connection between the discharge tube and the starting device is the same as that in FIG.

Further, in FIGS. 2 to 4, parts common to those in FIG. 1 are given the same numbers.

In FIGS. 2 and 3, the resistor 5 is composed of a filament made of tungsten, which is wound and fixed around an insulator 9 made of a heat-resistant insulating material such as alumina. This insulator 9 has a thickness of 2 to 3I+III+1
The width is 16-20mm and the length is 25-40m.

It is a rectangular plate body, and a plurality of grooves 9a for holding the resistor 6 are provided at regular intervals on two opposing sides.

Further, there are provided holes 9b, 9c for fixing the first and second bimetal switches 2, 3, and holes 9d, cae for attaching to a support column, which will be described later. A window 9f for transmitting light is still provided in the center.

As mentioned above, the first and second bimetal switches 2
, 3 are both attached to the insulator 9 using holes 9b and 9c, but the second bimetal switch 3 is attached to the resistor 6.
The bimetal switch 2 of the first option is placed a little away from the insulator 9 so as not to face a part of the resistor 5.

Thus, such a starting device is attached to the support column 15 as shown in FIG.
4 is connected between the power supply terminals. As you will see from now on,
The first bimetal switch 2 is located further away from the discharge tube 1 than the second bimetal switch 3.

According to such a configuration, the first bimetal switch 2
Since it is provided at a position farther from the resistor 6 than the second bimetal switch 3, it is less susceptible to the effects of radiant heat from the resistor 5, and therefore discharge of the discharge tube 1 is started when the discharge lamp is started. This will never open before it is released. The first bimetallic switch 2 also includes:
Since it is located far away from the discharge tube 1,
The temperature during operation of the discharge lamp is lower than that of the second bimetal switch 3, and therefore, when the discharge lamp is restarted, it always returns to the closed state before the second bimetal switch 3.

Therefore, the pulse voltage induced in the ballast by opening of the second bimetal switch 3 is always applied to the starting auxiliary conductor 4 via the first bimetal switch 2, and
will definitely restart at 7.

Further, according to the configuration in which the first and second bimetal switches 2.3 are provided at different positions from the discharge tube 1, there is no need to make the contact pressures of the two different, and no time is required to adjust the contact pressures.

As explained above, the present invention can provide a high-pressure discharge lamp embedded in a starter device that can ensure reliable operation during restart and can prevent shortening of the life of the resistor and ballast. It is something.

[Brief explanation of the drawing]

Fig. 1 is a lighting circuit diagram of a high pressure discharge lamp with a built-in starting device, Fig. 2 is a front view of essential parts showing an example of the starting device used in the high pressure discharge lamp of the present invention, Fig. 3 is a side view of the same, and Fig. 4 is a lighting circuit diagram of a high pressure discharge lamp with a built-in starting device. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a main part of a high-pressure discharge lamp with a built-in starting device which is an embodiment of the present invention. 1...Discharge tube, 2...First bimetal switch, 3...Second bimetal switch, 4...
...Starting auxiliary conductor, 5...Resistor, 6...
...Outside ball. Name of agent: Patent attorney Toshio Nakao and 1 other person 1 Netsho 5: t-85u (3) 4 Figure

Claims (1)

[Claims] A first starting auxiliary circuit consisting of a discharge tube, a starting auxiliary conductor provided on the outer surface of the discharge tube, and a first bimetal switch connected in series; A second starting auxiliary circuit formed in series with a bimetal switch is provided inside the outer sphere, and the return time of the first bimetal switch is set to be shorter than the return time of the second bimetal switch. A high-pressure discharge lamp with a built-in starting device.