JPH02210750A - Short arc discharge lamp - Google Patents

Abstract

PURPOSE:To make it possible to reduce the breakdown voltage by winding and fixing the tip of one end side of a trigger member to a projection, and connecting the other end side to the first base after fixing once to the first sealing tube. CONSTITUTION:The tip of one end side of a trigger member 40 is fixed to a projection 14 which is the remaining part of an exhaust tube formed near the second sealing tube 13 of a luminous space swelling 11. And the trigger member 40 is extended along the outer wall of the luminous space swelling 11 up to the first sealing tube 12 and wound to the shoulder of the first sealing tube 12, or fixed once by using an other member and then its other end is connected to the first base 31. As a result, the one end side is placed to have a sufficient distance along the surface from the second sealing tube at a grand electrode side. Consequently, not only the lighting is secured regardless of the sort of the lighting device, but also the break-down voltage can be reduced.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to short arc discharge lamps such as xenon-mercury discharge lamps used as light sources for ultraviolet irradiation devices and xenon discharge lamps used as light sources for movie projectors. It is related to.

[Conventional technology]

For example, in a xenon short arc discharge lamp filled with xenon, the starting voltage (hereinafter also referred to as breakdown voltage) may exceed 30 KV, and the voltage burden on the lighting device becomes considerably high, resulting in a reduction in the starting voltage applied from the lighting device. There are problems due to leakage, as well as an increase in the size and cost of the lighting device. For this reason, a trigger member has been disposed on the outer wall of the arc tube in order to reduce the breakdown voltage of the discharge lamp, and it is particularly effective to electrically connect this trigger member to a high voltage application electrode. It is known.

The conventional method of winding the trigger member that is electrically connected to the high voltage application electrode will be explained by taking as an example a discharge lamp in which the anode is on the high voltage application side as shown in FIG. 3. A first cap 31 on the anode side and a second cap on the cathode side are disposed on both sides of the arc tube 10, which consists of a first sealed tube section 12 on the anode side and a second sealed tube section 13 on the cathode side, which extend further. 32, one end of the trigger member 40 is wound around the shoulder 130 of the second sealed tube section 13 in a ring shape and fixed, and extends beyond the light emitting space bulge 11 to the first sealed tube section 12. It is wound again into a ring shape and fixed at the shoulder part 120 of the ring, and the other end is connected to the first base 31.

Note that 21 and 22 are a high voltage application electrode that is an anode and a ground electrode that is a cathode, respectively, which are arranged oppositely in the light emitting space bulge 11, and 23 and 24 are high voltage application electrode lead rods that are anode lead rods. and a ground electrode lead rod which is a cathode lead rod, and 14 is a protrusion made of the remainder of the exhaust pipe.

[Problem to be solved by the invention]

Depending on the type of lighting device, the conventional way of placing the trigger member described above may cause the second trigger member to break down between the electrodes.
There are cases where breakdown occurs between the ring-shaped part of the trigger member wound around the sealed tube part and the ground electrode lead rod, making it impossible to turn on the light, and the breakdown voltage cannot be lowered sufficiently.

The present invention has been made in view of the problems of the prior art as described above, and an object of the present invention is to provide a short arc discharge lamp that can be lit reliably regardless of the type of lighting device and that can reduce the breakdown voltage. With the goal.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a central light emitting space expansion in which a pair of high voltage application electrodes and a ground electrode are arranged opposite to each other, one of which is applied with a high voltage and the other is the ground side, at the time of startup. An arc tube consisting of an exit portion, a first sealed tube section on the high voltage application electrode side extending on both sides, and a second sealed tube section on the ground electrode side; A first cap that is attached to the tip side of the sealed tube section and is electrically connected to the high voltage application electrode, a second cap that is electrically connected to the ground electrode, and a ground for the light emitting space bulge. A short arc discharge lamp comprising a protrusion formed to protrude beyond the tip of the electrode toward the second soil pipe portion, and a trigger member disposed on the outer surface of the light emitting space bulge. , the trigger member is characterized in that one end of the trigger member is wound around and fixed to the protrusion, and the other end is once fixed to the first sealing tube portion and then connected to the first cap. .

[Effect]

The tip of one end of the trigger member is fixed to a protrusion formed on the outer wall on the ground electrode side of the bulging part of the light emitting space, and the other end is fixed to the first sealing tube part on the high voltage application side, and then the high voltage is applied. Since it is connected to the first base which is electrically connected to the application electrode, a sufficient creepage distance from the second sealed tube part on the ground electrode side is maintained on one end side, so that it can be connected to the ground electrode lead rod. There is no breakdown between the two, and the breakdown voltage can be lowered, as is clear from the experimental results described later.

〔Example〕

The present invention will be explained below based on the drawings.

FIG. 1 is an explanatory diagram of one embodiment of the present invention, in which the anode is on the high voltage application side. Sealed tube part 12
and a second sealing tube part 13 on the cathode side, and a first base 31 on the anode side and a first base 31 on the cathode side are provided at the tips of the first sealing tube part 12 and the second sealing tube part 13. The second base 32 is connected,
A high voltage application electrode 21 which is an anode and a ground electrode 22 which is a cathode and which are electrically connected to the first cap 31 and the second cap 32 are arranged to face each other in the light emitting space bulge 11. . Note that 23 and 24 are a high voltage application electrode lead rod which is an anode lead rod and a ground electrode lead rod which is a cathode lead rod, respectively.

A trigger member 40 is disposed on the outer wall of the light emitting space bulge 11 , and one end of the trigger member 40 is formed near the second sealing tube 13 of the light emitting space bulge 11 . It is fixed to the protrusion 14 which is the remaining part of the exhaust pipe, extends along the outer wall of the light emitting space bulge part 11 to the first sealing pipe part 12, and is wrapped around the shoulder part 120 of the first sealing pipe part 12. The other end is connected to the first cap 31 by rotating it or by fixing it once using another member.

FIG. 2 is an explanatory diagram of another embodiment according to the present invention,
After one end of the trigger member 40 is fixed to the protrusion 14,
It is arranged in a spiral manner from the light emitting space bulge part 11 to the first sealing tube part 12, and the other end is connected to the first base 31. This tensioning method is particularly effective because the trigger member 40 is less likely to loosen even when the temperature changes due to repeated turning on and off.

In this embodiment, the remaining part of the exhaust pipe is used as the protrusion 14 for fixing one end of the trigger member 40, but if the remaining part of the exhaust pipe is on the high voltage application electrode 21 side or if it is not suitable as a fixing means, the light emitting space will expand. A fixing protrusion may be separately formed on the protrusion 11.

However, when the remaining part of the exhaust pipe is attached to the ground electrode side, the distance from the shoulder part 130 of the second sealing pipe part 13 to L/1 with respect to the entire length of the light emitting space bulging part 11
Since the remaining part of the exhaust pipe is installed at the position of 5 to 2L/, 5, a sufficient creepage distance with the second sealed pipe part 13 is maintained, and the trigger effect in the light emitting space bulge part ll is effective. Therefore, it is most appropriate to use the remaining part of the exhaust pipe as the protrusion 14.

According to the above embodiment, one end of the trigger member 4o is fixed to the protrusion 14 of the light emitting space bulge 11, and the other end side is temporarily attached to the first
Since the trigger member 4o is fixed to the sealed tube part 13 and the other end is connected to the first cap 31, a sufficient creepage distance between the trigger member 4o and the second sealed tube part 13 is maintained, and lighting with a high starting voltage is possible. Even if the device is used, the trigger member 4o and the ground bridge lead rod 24
(As is clear from the experimental results described later, the breakdown voltage can be reliably lowered.)

In addition, if high voltage is applied to the cathode during startup, protrusion 1
Similar results can be obtained by reversing the position of 4 and the arrangement of the trigger member 40.

[Experiment example]

Examples of experiments conducted to demonstrate the effects of the present invention will be described below.

The discharge lamps used in the experiment were all short arc discharge lamps filled with xenon gas, and had a rating of 2 to -.

The experimental results are shown in Table 1, and the method of winding the trigger members A to D shown in the table is as follows.

A-11 Disposed only in the bulging part of the light emitting space (state B not connected to the high voltage application electrode in Fig. 3) B...Disposed in the bulging part of the light emitting space and connected to the high voltage applying electrode Connection (Fig. 3) C--How to wind the trigger member shown in Fig. 1 of the present invention D-1 How to wind the trigger member shown in Fig. 2 of the present invention As shown in Table 1, The short arc discharge lamps (C) and (D) with the invented trigger member wrapping method have a V reduction of up to 5°0 compared to the short arc discharge lamp (B), which conventionally had the lowest breakdown voltage. was observed, C
The breakdown voltage was never higher than that of the discharge lamp B). Furthermore, in the case of a discharge lamp (A) in which a trigger member is provided and not connected to a high voltage application electrode, the breakdown voltage is much higher than that of the present invention, from 2.5 KV to 7.5 KV.
It was observed that the voltage was higher than 5KV.

〔Effect of the invention〕

As explained above, in the short arc discharge lamp of the present invention, one end of the trigger member is fixed to the protrusion formed on the ground electrode side of the bulging portion of the light emitting space, and the other end is temporarily placed on the high voltage application electrode side. Since it is connected to the first cap which is fixed to the first sealed tube section of the 1st tube section and is electrically connected to the high voltage application electrode, one end side is connected to the creeping surface from the second sealed tube section on the ground electrode side. A sufficient distance is maintained, there is no breakdown between the trigger member and the ground electrode, and no matter what kind of lighting device is used, the light will not turn off.
As is clear from the experimental examples described above, the breakdown voltage can be lowered.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a short arc discharge lamp in which the trigger member is wound according to the present invention, FIG. 2 is an explanatory diagram of another embodiment of the short arc discharge lamp according to the present invention, and FIG. 3 is an explanatory diagram of a conventional short arc discharge lamp. FIG. 3 is an explanatory diagram of a short arc discharge lamp with a trigger member wound in the manner shown in FIG. 10-・Light-emitting tube 11-・Light-emitting space bulge part 1
2-First sealed tube part 3...-Second sealed tube part 14.
...Protrusion 21...High voltage application electrode 22-Ground electrode 23-
...High voltage application electrode lead rod 24-Ground electrode lead rod 31--First cap 32...Second cap 40
-・-Trigger member talent

Claims (1)

[Claims] At startup, a pair of high voltage application electrodes and a ground electrode, one of which is applied with a high voltage and the other is on the ground side, are arranged opposite to each other on both sides of a central light emitting space bulge. An arc tube consisting of a first sealed tube section on the extending high voltage application electrode side and a second sealed tube section on the ground electrode side, and the first sealed tube section and the second sealed tube section. A first cap that is attached to the tip side and is electrically connected to the high voltage application electrode, a second cap that is electrically connected to the ground electrode, and a tip of the ground electrode of the light emitting space bulge. A short arc discharge lamp comprising a protrusion formed to protrude beyond and toward the second sealed tube portion, and a trigger member disposed on the outer surface of the light emitting space bulge, the trigger member comprising: The short arc discharge lamp is characterized in that one end of the lamp is wound around and fixed to the protrusion, and the other end is fixed to the first sealed tube portion and then connected to the first cap. .