JPH11111221A - High pressure discharge lamp and lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system that stability of a lighting tube is improved. SOLUTION: A high pressure sodium lamp 11 has an exterior tube 21 and an Edison type in planted cap. An illumination tube 25 is contained in the exterior tube 21, and a lighting tube 36 is connected to the illumination tube. The lighting tube 36 is fixed to a support wire 32 by means of a holding body 37. The holding body 37 has an cut-out at a part, has spring characteristics, has a C-shaped ring part 38 to hold the lighting tube 36, holds the lighting tube 36 at the ring part 38, fixes the ring part 38 mechanically to the support wire 32 at a leg part 39. A thermal conductive member of a ceramic 40 is provided at the leg part to hardly transmit heat from the support wire 32 to the ring part 38.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure discharge lamp and a lighting device with improved stability of a lighting tube.

[0002]

2. Description of the Related Art Conventionally, as a high-pressure discharge lamp of this type, Toshiba Review Vol. 37, No. 2, pg.
The configuration of the high-pressure sodium lamp described on page 05 is known. This high-pressure sodium lamp has a light-emitting tube and a lighting tube for starting and lighting the light-emitting tube in an outer tube. The light-emitting tube is also supported on a light-emitting tube support that supports the light-emitting tube. Is fixed.

[0003]

However, in the case of the high-pressure discharge lamp, when the arc tube is turned on, the arc tube support is heated by the heat of the arc tube, and the arc tube support is heated. The tube may be heated and the ignition tube may be damaged.

In addition, for example, when used in a place where there is a lot of vibration, there is a problem that the lighting tube cannot be sufficiently supported and the lighting tube may fall off.

[0005] The present invention has been made in view of the above problems, and has as its object to provide a high-pressure discharge lamp and a lighting device in which the stability of a lighting tube is improved.

[0006]

According to the present invention, there is provided a high-pressure discharge lamp, comprising: an arc tube; a lighting tube for starting and lighting the arc tube; an arc tube support for supporting the arc tube; And a holder having a small heat conductive member having a low thermal conductivity for fixing the lighting tube to the body. Even when the support is heated, the heat of the arc tube support is hardly conducted to the ignition tube by the low heat conductive member, so that the ignition tube is not damaged by the heat and the stability of the ignition tube is improved. improves.

A high-pressure discharge lamp according to a second aspect of the present invention includes an arc tube, a lighting tube for starting and lighting the arc tube, an arc tube support for supporting the arc tube, and a spring property for the arc tube support. And a holder having a holding portion for fixing the lighting tube by holding the lighting tube with a spring. The lamp tube is securely held by the part, and the stability of the lamp tube is improved.

A high pressure discharge lamp according to a third aspect is the high pressure discharge lamp according to the first or second aspect, wherein the arc tube is:
Since sodium is used with power consumption of 100 W or more, the arc tube tends to be heated to a high temperature, but the stability of the ignition tube is improved by each action.

According to a fourth aspect of the present invention, there is provided a lighting device including the high-pressure discharge lamp according to any one of the first to third aspects and a fixture main body for accommodating the high-pressure discharge lamp.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An illumination device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway side view showing a high-pressure sodium lamp, FIG. 2 is a side view showing a holding state of a lighting tube, FIG. 3 is a plan view showing a holding state of a lighting tube, and FIG. FIG. 2 is a perspective view showing an appearance of a road lighting device.

As shown in FIG. 4, the road lighting device 1 comprises:
It is attached to the tip of the pole 2 and is disposed, for example, along a highway or a general road.

The road lighting device 1 has an appliance main body 3 having a substantially elliptical planar shape, and pole supports 4 and 4 for attaching to the pole 2 are formed at the base end of the appliance main body 3. ing. An opening 5 facing the lower surface is formed on the distal end side of the instrument main body 3, and a plurality of reflections for reflecting light irradiated toward the opening 5 toward the opening 5 are formed on the inner surface of the instrument main body 3. Plates 6 and 7 are mounted, and a lamp socket 8 is mounted on a base end side of these reflection plates 6 and 7 via a lamp socket mounting plate 9. A reflector 10 that reflects the emitted light is attached. The lamp socket 8 has a power consumption of 100
A high-pressure sodium lamp 11 of W or more, for example, 360 W is detachably mounted.

A substantially hemispherical glove 12 as a light-transmitting member is held by a frame 13 in the opening 5 and is attached to a hinge 14 provided on the instrument body 3 at the distal end of the opening 5 so as to be opened and closed. The frame 13 is held by the instrument body 3 with the glove 12 and the frame 13 closing the opening 5 by the latch 15 provided on the instrument body 3 on the proximal end side of the opening 5. Furthermore, a packing 16 for sealing the frame 13 in a watertight manner with the frame 13 closed to the tool body 3 is attached to the tool body 3.

As shown in FIG. 1, the high-pressure sodium lamp 11 has a bulb-shaped outer tube 21 made of hard glass, and a base 22 is attached to a base end of the outer tube 21. The base 22 is an Edison type screw-type base having a shell 23 and an eyelet terminal 24.

An arc tube 25 is accommodated in the outer tube 21.
In the luminous tube 25, conductive structures 28 and 29 to which electrodes (not shown) are attached are inserted into ends of a ceramic tube 26 of a monolithic tube such as translucent polycrystalline alumina or single crystal alumina, respectively. , 29 project from the ceramic tube 26 to the outside.

Further, such an arc tube 25 includes sodium (Na) and mercury (Hg), which are luminescent metals, and xenon (Xe), a rare gas which is an inert gas as a starting gas.
Gas is enclosed. Then, sodium and mercury are sealed in a state of sodium amalgam, and when lighted, sodium is almost completely evaporated, so that it does not exist as a liquid. Note that mercury may not be used.

A conductive structure located above the arc tube 25
Numeral 28 is mechanically connected to conductive support wires 32, 32 as an arc tube support via a bulb holder 31 made of a heat-resistant metal such as niobium (Nb) or tantalum (Ta).

On the other hand, a conductive structure located below the arc tube 25
29 is attached to a ceramic plate 33 having an insulating property, and the ceramic plate 33 is mechanically attached to support wires 32 by an attaching member 34.

Further, below the ceramic plate 33, there is provided a lighting tube 36 which is electrically connected in parallel with the conductive structure 29 to the arc tube 25 and has a built-in starting circuit having a bimetal or the like. The lighting tube 36 is fixed to the support wire 32 by a holder 37. The holding body 37 has a C-shaped ring part 38 that has a cutout in part and has a spring property and holds the lighting tube 36, and this ring part 38 is a leg part. Mechanically fixed to the support wire 32 at 39,
Each of the legs 39 has a ceramic 40 which is a low thermal conductive member, and transfers heat from the support wire 32 to the ring portion.
It is difficult to conduct to 38.

A conductive wire 41 is connected to the lighting tube 36,
The lower end of the support wire 32 and the conductive wire 41 are welded to sealing support wires 42 and 43, respectively. These sealing support wires 42 and 43 are connected to a stem 44 formed on the proximal end side of the outer tube 21. It is sealed and connected to the shell 23 of the base 22 and the eyelet terminal 24 by external conductors, respectively.

Further, a proximity conductor 45 as a starting auxiliary conductor formed by being bent in a substantially U-shape is fixed to the support wire 32, and the proximity conductor 45 is arranged in parallel with the arc tube 25. The proximity conductor 45 is made of a heat-resistant metal wire such as niobium or tantalum.

Further, a heater 46 is disposed in a coil shape around the lighting tube 36.

In the vicinity of the stem 44, a ring getter 47 is provided.
Is attached.

Next, the operation will be described.

First, when the high-pressure sodium lamp 11 is started, the bimetal inside the lighting tube 36 is heated in a glow state,
A kick voltage is generated by the operation of the bimetal in the lighting tube 36, and a pulse due to the kick voltage is superimposed on an AC waveform, and the high-pressure sodium lamp 11 is started and turned on.

Even if the high-pressure sodium lamp 11 heats up and heats the support wire 32, since the ceramic 40 of the holder 37 has low thermal conductivity, heat is not transmitted to the ring portion 38 and heat is applied to the lighting tube 36. Hard to cause damage.

Further, when the starting of the arc tube 25 is defective, the heater
In the high-pressure sodium lamp 11 of a pulse automatic stop type in which the ignition tube is heated by 46 and the starting pulse is stopped by maintaining the closed state of the bimetal in the ignition tube 36, at least the holding of the ignition tube 36 Partially ceramic 40
By using this, the heat of the heater 46 can be prevented from being damaged by heat conduction via the metal parts such as the support wire 32 during the stop of the pulse, that is, while the heater 46 is heating the lighting tube 36.

Further, since the lighting tube 36 is held by the ring portion 38 having a spring property urged in the contraction direction, the lighting tube 36 does not come off from the ring portion 38 even if there is vibration.

Here, the results of a continuous heating test using a heater in place of the arc tube 25, a life test for turning on the arc tube 25 with power consumption of 360 W, and a vibration test for applying vibration will be described with reference to Table 1. I do.

It should be noted that the lamp 1 is held by using a completely ring-shaped holder for holding the lighting tube 36, and is mounted without using the holder 37 having no ceramic 40, and the lamp 2 is a lighting tube. The lamp 3 is held by using a complete ring-shaped member, and is mounted by using a holder 37 having a ceramic 40. The lamp 3 is a ring-shaped lamp having a partially cut-out portion for holding the lighting tube 36. The lamp 4 is mounted without using the holder 37 having no ceramic 40, and the lamp 4 is held by using a ring-shaped lamp having a partly cutout for holding the lighting tube 36, One mounted using a holder 37 having ceramic 40 was used. Other configurations are the same.

[0032]

[Table 1] According to the experiment, in the case of using the ceramic 40, the lighting tube 36 is not affected by heat and is not easily damaged by heat, so that the lighting tube 36 is not damaged even if the arc tube 25 is continuously turned on. Therefore, it is possible to avoid a state in which starting cannot be performed.

Also, a ring-shaped holding body with a part cut away.
By using the 37, the lighting tube 36 is held with a spring property, so that the lighting tube 36 can be prevented from falling due to vibration. For example, even if the lighting device 1 is used on an effective road, Since the lighting tube 36 does not come off, the life is extended and the reliability is improved, which is particularly effective on a highway.

It should be noted that the ring portion 38 is not limited to the C-shaped one, and the same effect can be obtained by using a spiral spring.

[0035]

According to the high-pressure discharge lamp according to the first aspect of the present invention, by using a low thermal conductive member having low thermal conductivity for the holder, even if the arc tube is heated by the arc tube, the arc tube can be heated. Since the heat of the support is hardly conducted to the lighting tube by the low thermal conductive member, the lighting tube is not damaged by the heat, and the stability of the lighting tube can be improved.

According to the high pressure discharge lamp of the second aspect,
Since the holder has a holding portion for fixing the lighting tube with a spring property, the holding portion can be securely held by the holding portion even when vibration is applied, and the stability of the lighting tube can be improved. .

According to the high pressure discharge lamp of the third aspect,
In addition to the high-pressure discharge lamp according to the first or second aspect, since the arc tube is made of sodium having a power consumption of 100 W or more, the arc tube tends to generate high heat, but the respective effects can improve the stability of the ignition tube.

According to the illuminating device of the fourth aspect, since there is provided the fixture main body for accommodating the high-pressure discharge lamp of any one of the first to third aspects, the respective effects can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a high-pressure sodium lamp according to an embodiment of the present invention.

FIG. 2 is a side view showing a holding state of the lighting tube.

FIG. 3 is a plan view showing a holding state of the lighting tube.

FIG. 4 is a perspective view showing an appearance of the road lighting device.

[Explanation of symbols]

 3 Instrument body 11 High-pressure sodium lamp as high-pressure discharge lamp 25 Arc tube 32 Support wire as arc tube support 36 Lighting tube 37 Holder 38 Ring portion as holder

Claims (4)

[Claims] An arc tube, a lighting tube for starting and lighting the arc tube, an arc tube support for supporting the arc tube, and a small heat conductive low heat for fixing the arc tube to the arc tube support. And a holder having a conductive member. 2. An arc tube, a lighting tube for starting and lighting the arc tube, an arc tube support for supporting the arc tube, and a retainer for fixing the ignition tube to the arc tube support with a spring property. A high-pressure discharge lamp, comprising: a holder having a portion. 3. The high-pressure discharge lamp according to claim 1, wherein the arc tube is made of sodium having a power consumption of 100 W or more. 4. An illuminating device comprising: the high-pressure discharge lamp according to claim 1; and a fixture main body accommodating the high-pressure discharge lamp.