JPH11233069A - Rare-gas discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rare-gas discharge lamp with an enclosure not damaged easily if a thermosetting resin makes contact with an end part of the enclosure not only at the time of manufacture but also at the time of use. SOLUTION: This rare-gas discharge lamp is equipped with a straight-pipe shaped enclosure 1 having a luminous layer 2 on its inner surface, a pair of strip-like external electrodes 5, 6 each made up of a metallic member disposed to be spaced apart from each other on a peripheral surface of the enclosure substantially over its whole length, harness 10 led out from an end part of the enclosure and having electrical connection with the external electrodes, an insulating tubular member 12 disposed on the end part of the enclosure on the harness led-out side so as to locate the harness led-out part therewithin, and a protective member 13 excelling in an insulating property and packed into an inner space of the tubular member so as to cover the harness led-out part, and durometer D hardness of the protective member 13 is set at 80 or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rare gas discharge lamp, and more particularly to a rare gas discharge lamp in which a pair of band-shaped external electrodes are arranged on an outer peripheral surface of an envelope made of a glass bulb, and an end of the envelope is connected to the external electrode. The present invention relates to a rare gas discharge lamp having a harness having an electrical connection relationship and an improved protection structure of a harness leading portion.

[0002]

2. Description of the Related Art A conventional rare gas discharge lamp of this type is constructed by mounting insulating caps H, H at the end of a lamp main body DL as shown in, for example, FIGS. That is, in the lamp main body DL, A is a straight tubular envelope that is hermetically sealed by, for example, a glass bulb or the like,
On its inner surface, a light emitting layer B made of a phosphor such as a rare earth phosphor or a halophosphate phosphor is formed. In this light emitting layer B, an aperture portion Ba having no predetermined light emitting layer is formed over substantially the entire length. The sealing structure of the envelope A is configured by sealing a disk-shaped sealing glass plate to an end of a glass bulb. It can also be configured. The enclosed space of the envelope A contains xenon (Xe), krypton (Kr), neon (Ne), and helium (He) that do not contain metal vapor such as mercury.
Or a rare gas such as a single gas or a mixture thereof is sealed in a predetermined amount. A pair of strip-shaped external electrodes C and D made of an opaque metal member are arranged (adhered) on the outer peripheral surface of the envelope A at a predetermined distance from each other. The surface is made of a protective tube E made of, for example, a heat-shrinkable resin.
It is covered with. Terminals F, F are connected in advance to the ends of the external electrodes C, D, and harnesses G, G for connection to an external circuit are connected to the leading ends. on the other hand,
At the end of the lamp body DL, insulating caps H, H are provided.
Aperture Ba and mounting ears Hb, Hb of caps H, H
Are mounted so as to have a predetermined positional relationship. A thermosetting resin J such as an epoxy resin is injected and hardened into the inner spaces Ha, Ha of the caps H, H, whereby the lamp main body DL and the cap H are fixed.

In this rare gas discharge lamp, a high frequency high voltage (for example, 2 at 25 KHz) is applied to external electrodes C and D via a harness G.
By applying 500Vo-p), a rare gas discharge is generated, and the light emitting layer B is excited by a rare gas excitation line to emit light. Light is emitted from the aperture Ba to the ends of the external electrodes C and D. It is released to the outside through the opening between the parts. In particular, since no mercury is used in this rare gas discharge lamp, the light quantity rises sharply after lighting, and the light quantity reaches almost 100% at the same time as lighting. For this reason, facsimile and image
It is suitable as a light source for reading originals of OA equipment such as scanners and copiers.

[0004]

The rare gas discharge lamp is manufactured, for example, as follows. First, the cap H is arranged at the end of the lamp main body DL such that the end of the envelope A and the connection between the terminal F and the harness G are included in the internal space Ha. Next, epoxy resin J is injected into the internal space Ha of the cap H, and the space between the end of the lamp main body DL and the cap H is enhanced. Thereafter, the temporary assembly is left for 5 minutes in a heating furnace controlled at a temperature of about 120 ° C., and further for 2 hours at 60 to 80 ° C. Thereby, the epoxy resin J is thermally cured, and the end of the lamp main body DL and the cap H are firmly connected.

However, while this rare gas discharge lamp is incorporated into OA equipment such as a facsimile, an image scanner, and a copying machine, the rare gas discharge lamp does not normally turn on and functions as a light source for reading a document. May not work. A detailed examination of the rare gas discharge lamp, which did not light up normally, revealed that a small crack was found inside the cap H at the end face of the envelope A in contact with the epoxy resin J. From this, it is considered that the reason why the rare gas discharge lamp did not light up normally is that air entered the envelope from a minute crack.

Normally, since the glass bulb constituting the envelope A and the epoxy resin J have significantly different coefficients of thermal expansion, undesired stress acts on the respective contact interfaces,
In particular, it acts at the time of use in which a large temperature difference is generated during thermosetting or when the stress exceeds one of the strengths.
A member having low strength is destroyed. In this case, since the glass bulb is weaker in strength and the lamp main body DL is downsized, it is presumed that cracks are more likely to occur at the end face portion of the envelope A.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a rare gas discharge lamp in which even when a thermosetting resin is brought into contact with the end of the envelope, the envelope is hardly damaged during use as well as during manufacture. Is to provide.

[0008]

SUMMARY OF THE INVENTION Accordingly, in order to achieve the above-mentioned object, the present invention provides a straight tubular envelope having a light-emitting layer on the inner surface, and an outer peripheral surface of the envelope substantially over its entire length. A pair of band-shaped external electrodes made of a metal member spaced apart from each other, a harness derived from an end of the envelope and having an electrical connection with the external electrode; An end portion of the harness comprises a protective member having excellent insulating properties arranged so as to cover the lead-out portion of the harness.
The durometer D hardness is set to 80 or less.

A second invention of the present invention relates to a straight tubular envelope having a light-emitting layer on the inner surface, and a metal arranged on the outer peripheral surface of the envelope over substantially the entire length thereof. A pair of band-shaped external electrodes made of a member, a harness led out from an end of the envelope and having an electrical connection relationship with the external electrode, and an end of the envelope on the harness lead-out side In addition, an insulating tubular member arranged so that a lead portion of the harness is located inside, and a sufficient insulating property such that the lead portion of the harness covers the internal space of the tubular member. And a durometer D hardness of 8 for the protective member.
It is characterized by being set to 0 or less.

Further, according to a third aspect of the present invention, an insulating member is mounted on the outer peripheral surface of the envelope so as to cover an external electrode, and the insulating member is provided with a light-transmitting sheet. A fourth aspect of the present invention is that the protective member is formed of a thermosetting resin or a rubber-based member, and a durometer D of the protective member is formed of a heat-shrinkable resin. The hardness is set to 80 or less, and the fifth invention is characterized in that:
The tubular member is made of a flexible insulating member.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the rare gas discharge lamp according to the present invention will be described with reference to FIGS. In FIG. 1, reference numeral 1 denotes a straight tubular envelope which is hermetically sealed by a glass bulb or the like, and has a light emitting layer 2 made of a phosphor such as a rare earth phosphor or a halophosphate phosphor on its inner surface. Are formed. The light emitting layer 2 does not have the light emitting layer 2 having a predetermined opening angle.
a is formed over substantially the entire length. The sealing structure of the envelope 1 is formed by sealing a disk-shaped sealing glass plate 1a at the end of a glass bulb. It can also be configured. In the enclosed space of the envelope 1, a rare gas such as xenon (Xe), krypton (Kr), neon (Ne), and helium (He) which does not contain metal vapor such as mercury is used alone or mixed. A predetermined amount is enclosed.

A sheet structure 3 is mounted (wound) on the outer peripheral surface of the envelope 1. The sheet structure 3 is, for example, a translucent sheet having a length substantially equal to the entire length of the envelope 1.
A pair of strip-shaped external electrodes 5 and 6 made of a metal member are arranged on one surface of the
The external electrode portion extends outward from the end of
A, 6A are formed. In a state where the sheet structure 3 is mounted on the outer peripheral surface of the envelope 1, a first opening 7 is provided between one ends of the external electrodes 5 and 6, and a second opening 7 is provided between the other ends. The opening 8 is formed, and light from the light emitting layer 2 is mainly transmitted from the aperture 2a to the first opening 7.
Is released to the outside through In the sheet structure 3, an adhesive layer 9 and an adhesive layer 9a are formed on one surface of the translucent sheet 4 and the external electrodes 5, 6, and the external electrodes 5, 6 are translucent. It is adhered to the sheet 4 using an adhesive layer 9. Further, as the translucent sheet 4, for example, polyethylene terephthalate (PET) resin is preferable, and as the external electrodes 5, 6, for example, aluminum foil is preferable. However, other members can be applied.

Terminals 5A and 6A extending from the ends of the external electrodes 5 and 6 are connected to a lead portion 1 of a harness 10.
0a is electrically and mechanically connected by connecting means 11,11. Specifically, a pair of strip-shaped external electrodes 5 and 6 made of a metal member are separated from each other on one surface of a translucent sheet 4 having a length substantially equal to the entire length of the envelope 1. The terminal 5A, 6A is formed by disposing and extending the external electrode portions outward from the ends of the external electrodes 5, 6 to form terminals 5A, 6A.
The body 3 is wound around the outer peripheral surface of the envelope so that the external electrodes 5 and 6 are located between the envelope 1 and the translucent sheet 4, and the terminals of the sheet body 3 are connected. Harness 10, 5A, 6A
The ten leads 10a, 10a are electrically and mechanically connected by connecting means 11, 11 utilizing crimping.

The above-mentioned external electrodes 5, 6 and terminals 5A, 6A
Are made of the same member, for example, aluminum foil, and the thickness thereof is set in a range of approximately 10 to 100 μm. For example, when the aluminum foil is hard, its thickness is recommended to be set in the range of 10 to 50 μm, and when it is soft, its thickness is recommended to be set in the range of 30 to 100 μm. Here, the aluminum foil and its hardness and softness are generally described as follows. That is, aluminum foil is JIS H 416 in Japan.
Based on 0, the thickness range of 6 to 200 μm is defined as aluminum foil. The hardness and softness of the aluminum foil are classified according to the presence or absence of heat treatment, and the hardened foil is referred to as a hard foil, and the softened aluminum foil after annealing is referred to as a soft foil.

In particular, the width of the lead-out portion of the terminals 5A and 6A is
The width of each of the external electrodes 5 and 6 is smaller than that of each of the external electrodes 5 and 6.
Are connected by crimping using substantially ring-shaped connecting means 11, 11 including ends. The connection means 11, 11
Is constituted by a ring-shaped crimp terminal made of a metal member such as brass, nickel, stainless steel, etc., and the terminal 5A (or 6A) and the harness 10 are connected to the ring portion.
When the ring portions are crushed with a well-known crimping tool in a state where the lead portions 10a are overlapped, the terminals 5A and 6A of the external electrodes 5 and 6 and the lead portions 10a of the harness 10 are connected via the crimp terminals 11. Connected electrically and mechanically. The ring portion of the connection means (crimping terminal) 11 may be an endless ring having a slight gap in addition to an endless ring.

The terminals 5A, 6A and the harnesses 10, 1
For example, the connection portion with 0 is provided as follows.
That is, a cylindrical member (outer tube) 12 having an insulating property such as a resin material, a rubber material, a ceramic material, or the like is provided at the end of the envelope 1 with the terminals 5A, 6A and the harness 10, 10
A protective member 13 having excellent insulation properties such as a thermosetting resin such as a silicone resin or a rubber-based member is filled therein. In particular, the protective member 13 in the cured state is a durometer D conforming to JIS K 7515-1986 "Testing method for durometer hardness of plastic".
The hardness is set to 80 or less, preferably in the range of 80 to 30. The outer tube 12 is preferably made of a resin material having some flexibility or elasticity. For example, a polycarbonate resin is recommended.

Next, a method of manufacturing the rare gas discharge lamp will be described with reference to FIGS. First, FIG.
As shown in (b), for example, external electrodes 5 and 6 made of a long metal member having an adhesive layer 9a on one surface are provided on a translucent sheet 4 having an adhesive layer 9 on one surface. External electrode 5,
The sheet assembly 3 is manufactured by overlapping and adhering the terminals 5A and 6A integrally formed on the sheet 6 so as to protrude from the end of the translucent sheet 4. Next, the envelope 1 is sealed.
At one end 4a of the translucent sheet 4 in the structure 3;
By relatively rolling toward the other end 4b, the outer peripheral surface of the envelope 1 is covered with the sheet structure 3, the translucent sheet 4 is covered with the external electrodes 5, 6, and the terminal is provided. 5A and 6A are wound so as to be exposed, and one end 4a of the translucent sheet 4 is overlapped with the other end 4b and adhered by an adhesive layer 9 (see FIG. 3).

Next, as shown in FIG. 5, a crimp terminal 11 and a harness 10, which are connection means, are arranged at the tip of the terminal 5A (6A) extending on the end face side of the envelope 1. Then, the terminal 5A is inserted into the ring portion of the crimp terminal 11, and the lead portion 10a of the harness 10 is inserted into the ring portion so as to overlap the terminal 5A. In this state, a crimp terminal 1 is formed using a well-known crimping tool (not shown).
By crimping 1, the terminal 5A and the lead portion 10a of the harness 10 are crimped and connected, and the connection state shown in FIG. 1 is obtained. Next, an outer tube 12 is attached to the end of the envelope 1.
Is mounted so that the connection portion between the terminal 5A and the lead portion 10a of the harness 10 is located inside, and the protection member 1 is placed inside.
By filling and curing 3, rare gas discharge lamp is completed.

According to this embodiment, the protective member 13 is provided in the inner space of the exterior tube 12 mounted on the end of the envelope 1.
Is filled and hardened so that the connection portion between the terminal 5A and the lead portion 10a of the harness 10 is buried, and the durometer D hardness thereof is set to 80 or less. In addition, even if an undesired stress acts on the contact interface between the glass bulb constituting the envelope 1 and the protective member 13 during manufacturing and use, a considerable portion is absorbed by the protective member 13. Therefore, when a thermosetting resin such as a silicone resin is used as the protective member 13, even if an undesired stress acts on the contact interface with the end face of the envelope at the time of thermosetting, the stress is reduced by the protective member. 13 is absorbed by
Further, even if an undesired stress is applied in the case of operating in a mode in which a large temperature difference occurs during use, the crack is generated on the end face of the envelope because the protection member 13 absorbs the undesired stress. A high quality product can be obtained. However, the durometer D of the protection member 13
If the hardness exceeds 80, the absorption of stress becomes insufficient, and the effect of suppressing crack generation is impaired.

The connection between the terminals 5A, 6A and the harness 10 is surrounded and supported by the protective member 13 filled in the outer tube 12, so that the harness 10 is connected.
Even if a pulling force acts on the terminals 5A and 6A via the terminal, the cutting of the terminals 5A and 6A can be reduced or suppressed. However, if the durometer D hardness of the protection member 13 is less than 30, the protection member 1 will not work when a tensile force is applied.
3, the terminals 5A and 6A are easily cut. Therefore, the lower limit of the durometer D hardness is desirably 30.

In particular, the connection between the terminals 5A, 6A extending from the external electrodes 5, 6 and the harness 10 is made by connecting the terminals 5A, 6A and the harness to the ring portion of the connecting means 11 comprising crimp terminals. Since the connection can be performed by performing a crimping operation in a state of being inserted so as to be superimposed on 10, the connection workability can be greatly improved, and the cost can be reduced.

FIG. 6 shows a second embodiment of the present invention. The basic configuration is the same as that of the first embodiment. The different point is that the lead-out portion of the terminal 5A (6A) is folded back and bonded so that the adhesive layer 9a is on the inside.
Aa (6Aa) was formed, and the lead portion 10a of the harness 10 was crimped and connected to this portion using the connection means 11. The folded portion 5Aa is formed by folding the lead-out portion 5A in the direction of the arrow as shown in FIG.

According to this embodiment, since the thickness of the terminal 5A at the crimped portion is doubled, the connection means 11
When the crimping is performed, the terminal 5A can be effectively prevented from being cut from the folded portion 5Aa. Paradoxically, since the strength of the lead-out portion is improved by the formation of the folded portion 5Aa, the crimping strength can be increased.
The reliability of connection with A can be further improved. Especially,
The durometer D of the protection member is improved by improving the strength of the terminal 5A.
Even in a region where the hardness is small, it can sufficiently withstand a relatively large tensile force.

FIG. 7 shows a third embodiment of the present invention. The basic configuration is the same as that of the first embodiment. The difference is that the extension 4A of the translucent sheet 4 is superimposed on the lead-out portion of the terminal 5A (6A). The extension 4A extends outward from the end of the translucent sheet 4 to the terminal 5A.
It is extended with almost the same width as. Then, the overlapping portion of the extension portion 4A and the terminal 5A is inserted into the ring portion of the connection means 11, and the lead portion 10 of the harness 10 is inserted.
a is inserted into the ring portion so as to overlap the terminal 5A, and then crimped and connected using a crimping tool. Prior to the crimping, the adhesive layer 9a of the terminal portion to which the harness 10 is brought into contact is formed in advance in order to improve the reliability of the electrical connection.
It is desirable to remove them.

According to this embodiment, although the thickness of the terminal 5A at the crimp connection portion is as thin as 10 to 100 μm, for example,
Since the extension 4A of the translucent sheet 4 is superimposed on the outer surface side, the strength of the extension 4A is reinforced and the connecting means 11
When crimping is performed, cutting from the terminal 5A can be effectively prevented. In particular, if the thickness of the translucent sheet 4 is set to, for example, a thick region, the effect of reinforcing the terminal 5A is improved, the crimping can be performed with a sufficient crimping force, and the reliability of the connection can be improved. .

FIG. 8 shows a fourth embodiment of the present invention, and the basic configuration is the same as that of the third embodiment. The difference is that the lead-out portion of the terminal 5A (6A) is connected to the adhesive layer 9a.
Is turned inside so as to form a folded back portion 5Aa, and the lead portion 10a of the harness 10 is crimped and connected to this portion using the connecting means 11. In addition, as shown in FIG. 6B, the folded portion 5Aa is configured by folding the lead-out portion 5A in the direction of the arrow shown. Then, the overlapping portion of the extension portion 4A and the folded portion 5Aa of the terminal 5A is inserted into the ring portion of the connecting means 11, and the lead portion 10a of the harness 10 is connected to the folded portion 5Aa.
After being inserted into the ring portion so as to be superimposed on each other, it is crimped and connected using a crimping tool.

According to this embodiment, the thickness of the crimped portion is much larger than that of each of the above embodiments due to the folded portion 5Aa of the terminal 5A and the extension 4A of the translucent sheet 4. The strength of the same portion is further reinforced. Accordingly, not only a highly reliable connection structure can be obtained, but also in a region where the durometer D hardness of the protective member is small, even if an undesirably large external force acts on the harness 10, the terminal 5A can be further cut. Can be reduced to

FIG. 9 shows a fifth embodiment of the present invention, and the basic configuration is the same as that of the first embodiment. The difference is that after the external electrodes 5 and 6 configured as shown in FIG. 2B are attached to the outer peripheral surface of the envelope 1 using an adhesive layer (not shown), the outer peripheral surface of the envelope 1 is Further, a translucent sheet 40 such as a PET resin having an adhesive layer on one surface is wound and adhered so as to cover the external electrodes 5 and 6.

According to this embodiment, the electrical connection between the harness and the external electrodes 5 and 6 is equivalently improved, although the mechanization and work efficiency are inferior to those of the above-described embodiments. The effect can be expected. In particular, if a light-transmitting insulating film such as a silicone varnish is formed on the outer peripheral surface of the envelope 1 before winding the light-transmitting sheet 40, the dielectric strength between the external electrodes is improved. it can. In this embodiment, second to fourth
The crimp connection structure shown in the embodiment can be applied.

FIG. 10 shows a sixth embodiment of the present invention, and the basic configuration is the same as that of the fifth embodiment.
The difference is that after the external electrodes 5 and 6 configured as shown in FIG. 9B are attached to the outer peripheral surface of the envelope 1 using an adhesive layer (not shown), the outer peripheral surface of the envelope 1 is A protective tube 50 made of a heat-shrinkable resin such as a PET resin is attached so that the external electrodes 5 and 6 are covered, and heat-shrinks. After the protective tube 50 is mounted on the envelope 1, it is heated to, for example, about 150 to 200 ° C. and shrunk, so that it is brought into close contact with the outer peripheral surface of the envelope 1.

According to this embodiment, as compared with the fifth embodiment, although the mechanization and work efficiency are slightly inferior, the hardware
The same improvement can be expected for the electrical connection between the nest and the external electrodes 5 and 6. In particular, if a light-transmitting insulating film such as a silicone varnish is formed on the outer peripheral surface of the envelope 1 before winding the light-transmitting sheet 40, the dielectric strength between the external electrodes is improved. it can. Incidentally, the crimp connection structure shown in the first to fourth embodiments can be applied to this embodiment.

FIGS. 11 to 12 show a seventh embodiment of the present invention. The basic configuration is the same as that of the first embodiment. The difference is that the outer tube 12 surrounding the protection member 13 is omitted. Specifically, it is manufactured as follows. First, as shown in FIG. 12, the envelope 1 is supported in an upright state, and the semi-cylindrical molds 20, 20 are mounted on the upper end portion of the envelope 1, and the translucent sheet of the envelope 1 is provided. To 4
Attach so that it is sandwiched. In this state, the protective member 13 is filled into the cavity 21 formed in the end face portion of the envelope 1 by closing the molding dies 20, 20, and is cured. After that, the rare gas discharge lamp of FIG. 11 is completed by removing the molds 20, 20 from the ends of the envelope.
The durometer D hardness of the protection member 13 is set to 80 or less, for example, in the range of about 80 to 50.

According to this embodiment, mass productivity can be improved by forming the molding dies 20 and 20 in a multiple series, and the cost can be reduced by omitting the outer tube. The configuration of the second to sixth embodiments can be applied to this embodiment.

The present invention is not limited to the above embodiment. For example, the electrical connection between the harness and the external electrode is made by a connection means using a crimp terminal or the like. Connection means such as an adhesive, welding, and soldering can also be applied. In particular, in the form of an external electrode,
The term "strip-shaped" means that the overall shape is a strip-like shape, and not only those having an irregular shape such as a triangular, semi-circular, or rectangular shape at the end of the external electrode, but also a portion other than the end. A hole or the like or a stitch-like shape is also included.

[0035]

Next, an experimental example will be described. 8m outside diameter
Figure 4 shows an envelope made of lead glass with a length of 300 mm.
Wind and closely contact the sheet structure shown in (1). In this sheet structure, a PET resin having a thickness of 50 μm is used for the light-transmitting sheet, and a silicone resin having a thickness of 25 μm is formed on the entire surface of the sheet in contact with the envelope. Adhesive is applied and formed. The external electrode is formed of a soft aluminum foil with a thickness of 50 μm, and is formed in a strip shape having a length of 290 mm and a width of 8 mm. 2.5 width
mm, a terminal having a protrusion length (extended length) of 4 mm is integrally formed. Note that an acrylic resin adhesive having a thickness of 20 μm is formed on the entire surface of the external electrode on the side in contact with the envelope. Next, the terminal of the sheet assembly and the lead portion of the harness are inserted into the ring portion of the ring-shaped crimp terminal (connection means) having a width of 2 mm and an inner diameter of 3 mm so as to overlap. The crimp terminal is made of brass, and a copper undercoat of 1 to 2 μm is formed on the surface thereof, and a solder plating of 3 to 5 μm is further formed thereon. Next, the crimp terminal is crimped using a known crimping tool. Thus, the harness and the terminal are electrically and mechanically connected. After that, the thickness is 300μm and the length is 11mm
Attach the outer tube made of polycarbonate resin to the end of the envelope so that the connection part is arranged inside,
12 after filling silicone resin (protection member) inside
Heat to 0 ° C for 5 minutes to cure. A rare gas discharge lamp in which the durometer hardness D of the silicone resin was set in the range of 20 to 90 was manufactured.

These rare gas discharge lamps are left at −40 ° C. for 30 minutes, then rapidly raised to 80 ° C. and left for 30 minutes, and then from 80 ° C. to −40 ° C. A 10-hour thermal shock test was performed in which it was dropped rapidly and left for 30 minutes.
After the cycle was repeated, the occurrence of cracks at the contact interface between the silicone resin and the end face of the envelope was observed, and the results shown in FIG. 13 were obtained. As is clear from the figure, no crack was observed when the durometer D hardness was 80 or less, but cracks were observed when the hardness was 90. As a precautionary measure, a harness is connected between the external electrodes of the rare gas discharge lamp having a crack through a harness.
Even when a high frequency high voltage of 2500 Vp-p at KHz was applied, no light was emitted.

Further, when a tensile force of 10 kg was applied to the harness derived from the silicone resin and the presence or absence of cutting at the aluminum terminal portion was observed, the result shown in FIG. 13 was obtained. As is clear from the figure, no cut was found in the aluminum terminal when the durometer D hardness was 30 or more, but cut was found in 20.

Therefore, from the above results, it is recommended that the durometer D hardness of the silicone resin (protective member) be 80 or less, and particularly, the range of 80 to 30 is recommended.

[0039]

As described above, according to the present invention, a protective member having excellent insulating properties is disposed at the end of the envelope so as to cover the lead-out portion of the harness. Because its durometer D hardness is set to 80 or less,
During manufacturing and use, even if undesired stress acts on the contact interface between the envelope and the protective member, the stress is effectively absorbed by the protective member. Therefore, when a thermosetting resin such as a silicone resin is used as the protective member, even if an undesired stress acts on the thermosetting resin or in a use mode where a large temperature difference occurs, Since it is absorbed by the protection member, crack damage at the end face of the envelope can be reduced, and a high-quality product can be obtained.

In particular, a tubular member is attached to the end of the envelope,
If the protective member is enriched in the internal space so that the harness lead-out part is buried, not only can the protection member protect the harness lead-out part reliably,
The protection member can be easily arranged at the end of the envelope.

Further, the durometer D hardness of the protective member is set to 80.
If it is set in the range of ~ 30, not only crack breakage,
Even if a large pulling force acts on the harness, disconnection of the terminal at the connection portion with the harness can be suppressed.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a first embodiment of a rare gas discharge lamp according to the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a U-U sectional view of FIG. 1;

FIG. 4 is a view showing a sheet structure according to the present invention;
5A is a view showing a developed state, and FIG. 5B is a cross-sectional view taken along the line V-V in FIG.

FIG. 5 is a cross-sectional view showing a disassembled state of the terminal and the harness according to the present invention before connection by the connection means.

FIG. 6 is a view showing a second embodiment of the rare gas discharge lamp according to the present invention, and FIG. 6 (a) is a sectional side view of a main part showing a connection state of a terminal and a harness by connection means. FIG. 2B is a side sectional view showing a state before connection.

FIG. 7 is a view showing a third embodiment of the rare gas discharge lamp according to the present invention, and FIG. 7 (a) is a sectional side view of a main part showing a connection state of a terminal and a harness by connection means. FIG. 2B is a plan view of FIG.

FIG. 8 is a diagram showing a fourth embodiment of the rare gas discharge lamp according to the present invention, and is a cross-sectional side view of a main part showing a connection state of a terminal and a harness by a connecting means.

9 is a view showing a fifth embodiment of the rare gas discharge lamp according to the present invention, wherein FIG. 9 (a) is a longitudinal sectional view, and FIG. 9 (b) is an external electrode shown in FIG. FIG.

FIG. 10 is a longitudinal sectional view showing a sixth embodiment of the rare gas discharge lamp according to the present invention.

FIG. 11 is a side sectional view showing a rare gas discharge lamp according to a seventh embodiment of the present invention.

FIG. 12 is a side sectional view for explaining a method of forming the protection member shown in FIG. 11;

FIG. 13 is a diagram showing the relationship between the presence or absence of cracks and the presence or absence of aluminum terminal cutting with respect to the durometer D hardness of the protective member.

FIG. 14 is a partially cutaway side view of a conventional rare gas discharge lamp.

FIG. 15 is a sectional view taken along line XX of FIG. 14;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Enclosure 2 Light emitting layer 2a Aperture part 3 Sheet structure 4,40 Translucent sheet 4A Extension part 5,6 External electrode 5A, 6A Terminal 5Aa Folding part 7 First opening 8 Second Opening 9, 9a Adhesive layer 10 Harness 10a Lead 11 Connecting means 12 Cylindrical member (exterior tube) 13 Protective member 20 Mold 21 Cavity part 50 Protective tube

Claims (5)

[Claims] 1. A pair of band-shaped external electrodes formed of a straight tubular envelope having a light-emitting layer on the inner surface and metal members arranged on the outer peripheral surface of the envelope over substantially the entire length thereof. And a harness derived from an end of the envelope and having an electrical connection relationship with an external electrode, and a harness leading portion is disposed on the end of the envelope so as to cover the harness. A rare gas discharge lamp comprising a protective member having excellent insulating properties, wherein the durometer D hardness of the protective member is set to 80 or less. 2. A pair of band-shaped external electrodes formed of a straight tubular envelope having a light-emitting layer on the inner surface and metal members arranged on the outer peripheral surface of the envelope over substantially the entire length thereof. And a harness derived from the end of the envelope and having an electrical connection relationship with the external electrode, and a harness leading portion at an end of the envelope on the harness leading side. A cylindrical member having an insulating property arranged so as to be located inside, and a protective member having an excellent insulating property so that a lead-out portion of a harness is covered in an inner space of the cylindrical member. A rare gas discharge lamp, wherein the durometer D hardness of the protective member is set to 80 or less. 3. An insulating member is mounted on the outer peripheral surface of the envelope so as to cover an external electrode, and the insulating member is formed of a protective sheet made of a light-transmitting sheet or a heat-shrinkable resin. −
The rare gas discharge lamp according to claim 1, wherein the rare gas discharge lamp is constituted by a bulb. 4. The protection member is made of a thermosetting resin or rubber-based member, and has a durometer D hardness of 80.
The rare gas discharge lamp according to claim 1, wherein the lamp is set as follows. 5. The rare gas discharge lamp according to claim 2, wherein the tubular member is formed of a flexible insulating member.