JP2009277531A - Double-pipe type rare-gas discharge lamp and method of manufacturing double-pipe type lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double-pipe type rare-gas discharge lamp in which a positional relationship between a rare-gas discharge lamp and an external pipe is reliably maintained, and distal openings of the external pipe are readily blocked, and to provide a method of manufacturing double-pipe type lamp that provides high yield and high productivity. <P>SOLUTION: The double-pipe type rare-gas discharge lamp includes: a rare-gas discharge lamp 10 formed of an elongated glass pipe having a pair of external electrodes 12; and caps for blocking a translucent insulating cylinder as an external pipe that houses the entire rare-gas discharge lamp in a substantially hermetically sealed state and distal openings thereof, wherein the caps are formed of a resin molded to include the translucent insulating cylinder and ends of the lamp. The method includes the steps of: disposing a ring-shaped seal member at the ends of the lamp; housing the lamp into the translucent insulating cylinder; and forming the caps by molding the resin at the ends of a body structure comprising a combination of the translucent insulating cylinder and rare-gas discharge lamp. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rare gas discharge lamp used for OA reading such as a copy or a scanner, or for general lighting, advertising, backlighting for a signboard, and the like. The present invention relates to a double tube type rare gas discharge lamp in which a rare gas discharge lamp is arranged.

  A so-called external electrode type discharge lamp is formed by forming a pair of substantially strip-shaped external electrodes on the outer surface of the arc tube in the axial direction of the arc tube, forming a phosphor layer on the inner peripheral surface of the arc tube and enclosing a rare gas. It is configured as follows. For example, Patent Document 1 discloses a rare gas discharge lamp.

The structure of the technique described in Patent Document 1 will be described with reference to FIGS.
(1) FIG. 4 relates to the prior art (a) Explanatory view showing an enlarged main part for explaining a part of the manufacturing process of the rare gas discharge lamp, (b) The lid member shown in FIG. It is the front view seen from the side, (c) It is sectional drawing which shows the edge part area | region of a double tube type rare gas discharge lamp.
In this rare gas discharge lamp 40, when a high frequency and high voltage of about 1600 V, for example, at 30 kHz and peak voltage are applied between the external electrodes 42 and 42, a dielectric barrier is formed inside the arc tube 41 made of a glass tube. Discharge occurs. At that time, the xenon sealed in the arc tube is excited to generate ultraviolet light having a wavelength of 172 nm, and the ultraviolet light excites the light emitting layer 43 formed of the phosphor film formed inside the arc tube 41, and visible light is emitted. And is taken out from the opening between the electrodes 42 and 42.

  The outer tube 50 is made of a translucent cylindrical member and can accommodate the entire length of the lamp 40. A flexible lid member 60 is attached to the end of the outer tube 50 and filled with the adhesive F so as to be closed in a substantially sealed state.

  The lid member 60 is accommodated in the outer tube 50 with the holding portion 61 protruding toward the center surrounding the end portion of the arc tube 41, whereby the tube shaft of the rare gas discharge lamp 40 and the outer tube 50 are accommodated. The positional relationship between the two is specified and supported so that the tube axis coincides. In designing this part, by approximating the actual dimensions of the outer diameter of the lamp and the inner diameter of the outer tube, the positional relationship between the lamp and the outer tube can be manufactured as desired, and the sealing performance is increased. Convenient.

  The lid member 60 is made of a synthetic resin having high heat resistance such as silicone and urethane, which is rich in elasticity and elasticity.

JP 2007-324034 A

  The manufacturing process of the rare gas discharge lamp described above will be briefly described. (1) The axis of the rare gas discharge lamp 40 and the axis of the outer tube 50 are coaxially or in a predetermined positional relationship. The lid member 60 is attached to the lid member 60, and (3) the adhesive is injected from the opening 62 formed in the lid member 60 in advance. This work is performed by the worker for one lamp and one lamp. However, since the lid member 60 is necessary at both ends of the rare gas discharge lamp 40, there is a problem that man-hours are large and productivity is poor. .

  In recent years, rare gas discharge lamps are expected to be used for lighting in many situations. However, in all fields, miniaturization and space saving have progressed, and the inner diameter of the translucent insulating cylinder that forms the outer tube. The difference between the outer diameter of the lamp and the lamp is getting smaller. As a result, in the above-described lid member, the thickness of the holding portion (61) shown in FIG. 5 is as small as, for example, 0.5 mm or less. In some cases, the occurrence rate of defects is high, the yield is poor, and even if the fitting is not properly performed, the sealing performance of the outer tube cannot be reliably maintained.

Accordingly, the present invention provides a double tube type rare gas discharge lamp that can reliably maintain the positional relationship between the rare gas discharge lamp and the outer tube and can close the end opening of the outer tube in a substantially sealed state by a simple method. The purpose is to provide.
It is another object of the present invention to provide a method for manufacturing a double-tube lamp capable of securely mounting a lid member, having a good yield and excellent productivity.

Therefore, the double tube type rare gas discharge lamp according to the present invention includes an elongated glass tube and a rare gas sealed in the glass tube, at least one of which is disposed outside the glass tube and spaced apart from each other. A rare gas discharge lamp comprising a pair of electrodes arranged along an axis, a translucent insulating cylinder that accommodates the entire rare gas discharge lamp in a substantially sealed state, and the translucency A cap for closing the end opening of the insulating cylinder;
The cap includes an end portion of a translucent insulating cylinder and a rare gas discharge lamp, and is formed by molding using a thermoplastic resin or a thermosetting resin.
Further, an annular seal member is disposed in the gap between the rare gas discharge lamp and the light-transmitting insulating cylinder at the end of the rare gas discharge lamp,
The cap is arranged outside the seal member in the length direction of the rare gas discharge lamp.
In addition, a protective layer made of a resin is disposed on the outer periphery of the translucent insulating cylinder, and the cap is attached to the translucent insulating cylinder so as to accommodate an end portion of the protective layer. .
The method for manufacturing a double-tube lamp according to the present invention is a method for manufacturing a double-tube lamp comprising a lamp having an elongated glass tube and a light-transmitting insulating cylinder that accommodates the lamp. There,
Disposing an annular sealing member at the end of the glass tube of the lamp;
Accommodating the lamp in the translucent insulating cylinder; and
And a step of forming a cap by molding using a thermoplastic resin or a thermosetting resin at the end of the structure that combines the light-transmitting insulating cylinder and the rare gas discharge lamp. To do.

According to the double tube type rare gas discharge lamp according to the present invention, the cap is formed by resin molding, so that the end of the outer tube can be easily and reliably obtained regardless of the dimensions of the lamp and the outer tube. The part opening can be closed in a substantially sealed state.
In addition, since an annular sealing member is disposed between the lamp and the outer tube, the resin does not excessively penetrate into the outer tube during the molding operation, and the resin enters the light extraction portion region and becomes a dark portion. Therefore, it is possible to provide a double tube type rare gas discharge lamp having a good yield and excellent productivity.
And according to the manufacturing method of the double tube type rare gas discharge lamp according to the present invention, the lid member is manufactured by molding in a state where the rare gas discharge lamp is positioned in the inside of the translucent insulating cylinder. Therefore, the lid member can be securely attached, the yield is good, and the productivity is excellent.

Hereinafter, the method of the present rare gas discharge lamp will be described based on embodiments with reference to FIGS.
FIG. 1A is a perspective view of a rare gas discharge lamp, and FIG. 1B is a perspective view of a translucent insulating cylinder. FIG. 2 is an explanatory view for explaining how the end portion of the translucent insulating cylindrical body is molded, and FIG. 3 is for explaining the overall configuration of the double tube type rare gas discharge lamp according to the present embodiment. It is explanatory drawing which shows the partial structure of this in a cross section.
In FIG. 1A, the arc tube 11 of the rare gas discharge lamp 10 is made of a straight tubular glass tube which is a translucent dielectric, and a phosphor is applied over the entire inner surface of the inside thereof. A light emitting layer 15 is formed, and a rare gas containing xenon gas as a main VUV light emitting element is sealed and hermetically sealed at both ends of the glass tube.

  A pair of conductive external electrodes 12 and 12 are arranged on the outer surface of the arc tube 11 so as to be spaced apart from each other in the axial direction, thereby forming a rare gas discharge lamp 10. Examples of the material of the arc tube 11 include soda lime glass, aluminosilicate glass, borosilicate glass, and barium glass. The external electrodes 12 and 12 are not particularly limited as long as they are electrically conductive, and specifically, gold, silver, nickel, carbon, gold palladium, silver palladium, and platinum are preferably used. This is realized by sticking a tape-like metal to the outer surface of the arc tube 11, or screen printing and baking a conductive paste in which the metal and the low melting point glass are mixed.

  At one end portion 11 </ b> A of the arc tube 11, power supply lines 13 and 13 for supplying power to the external electrodes 12 and 12 are electrically connected by connection means such as a conductive paste 14.

  FIG. 1B shows a light-transmitting rare gas discharge lamp 10 having a light-transmitting property with both ends opened, and is housed inside the light-insulating cylindrical body 20 shown in FIG. The translucent insulating cylinder 20 is preferably made of glass such as soda lime glass, aluminosilicate glass, borosilicate glass, or barium glass. Of course, as long as it has water resistance and durability, it is not limited to glass, and for example, polycarbonate, acrylic, polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP) and the like can be used.

  A protective layer 22 made of a translucent resin is formed on the outer peripheral surface of the translucent insulating cylinder 20 in advance so as to cover the entire surface. This is to prevent the fragments from scattering when the translucent insulating cylinder 20 (and the rare gas fluorescent lamp) is damaged. The protective layer 22 is made of, for example, polyethylene terephthalate (PET), polyolefin, fluorine. A heat-shrinkable tube such as resin or silicone can be used, or a film such as silicone can be formed by a technique such as dipping. The thickness of the translucent protective layer 22 is about 0.2 to 2 mm, and is preferably formed over substantially the entire length of the translucent insulating cylinder 20.

Hereinafter, the manufacturing procedure of the double tube type rare gas discharge lamp will be described in detail.
As shown in FIG. 1, an annular seal member 21 is attached to the end portions 11 </ b> A and 11 </ b> B of the arc tube 11 in the rare gas discharge lamp 10. In the drawing, the portion is on the outer peripheral surface of the straight portion of the arc tube 11 and does not reach the light extraction portion region. The seal member 21 is made of, for example, nitrile rubber, styrene rubber, silicone rubber, fluorine rubber, or the like, and can be expanded and contracted. Practically, an O-ring can be preferably used. In addition to the both end portions (11A, 11B), it is also possible to dispose in the vicinity of the center portion as long as the emitted light is not largely blocked.

  When the lamp 10 in the state shown in FIG. 1A is inserted into the translucent insulating cylinder 20, the thickness of the seal member 21 is substantially constant over the entire circumference, and the lamp 10 and the translucent insulating cylinder 20. Are temporarily fixed with their axes aligned. In this manner, a lamp structure including the rare gas discharge lamp 10 and the translucent insulating cylinder 20 is manufactured.

Subsequently, as shown in FIG. 2, the lamp assembly L is accommodated in, for example, a first mold MC1, and a second mold MC2 having an injection hole N at the bottom is disposed at the peripheral portion. For the sake of convenience, this figure shows a state in which the tube is rotated 90 ° around the axis of the tube relative to FIG. 1, that is, the external electrodes are shown on the front side and the back side of the paper, and only the power supply side is enlarged. It shows.
As shown in the figure, the power supply line 13 is led out through a lead-out hole K for feeding line lead formed at a predetermined location of the mold MC2. In this state, an insulating filler (resin agent) S such as a molten hot melt is injected from the injection hole N into the cavity of the mold. The insulating filler S is filled without gaps around and inside the cylindrical body 20.

  Insulating filler S (that is, cap 30) is made of ethylene vinyl acetate copolymer (EVA), polyolefin copolymer (PP), polyamide (PA), synthetic rubber (SR), etc. in a heated state. Those having good fluidity and good heat resistance after curing are preferred, and polyamide resins are particularly preferred. In this way, when the insulating filler S is molded and cured (solidified) in a state where both ends of the translucent insulating cylinder 20 are accommodated, the cap 30 shown in FIG. 3 is completed.

FIG. 3 is an explanatory view showing a part of the double tube type rare gas discharge lamp manufactured by the above-described method in a cross-sectional view.
The rare gas discharge lamp 10 is arranged inside the translucent insulating cylinder 20 so that the axes thereof coincide with each other, and the cap 30 is fixed to both ends of the cylinder 20 so that the opening is closed. A substantially sealed space is formed inside. At the same time, the cap 30 is filled with the tip 30 </ b> A inside the translucent insulating cylinder 20 in contact with the seal member 21. As a result, the rare gas discharge lamp 10 is securely fixed and held on the translucent insulating cylinder 20 by the cap 30.

  In order to seal both ends of the translucent insulating cylinder 20, it is necessary to reliably inject a resin agent into the gap between the inner periphery of the cylinder 20 and the outer periphery of the lamp 10. On the other hand, if the resin agent flows excessively toward the center of the lamp, the resin agent blocks the light emitted from the lamp and becomes a dark portion, which causes a disadvantage that the light extraction portion area becomes small. With respect to such a problem, according to the present invention, since the sealing member 21 is disposed between the rare gas discharge lamp 10 and the permeable insulating cylinder 20, the insulating filler is excessive in the central portion of the lamp. Infiltration is prevented and can always be defined at a predetermined position. Accordingly, the filler does not flow in the end region of the lamp and an undesired non-light emitting portion is not formed, and the cap can always be disposed at a predetermined position, so that the translucent insulating cylinder 20 can be reliably secured. It can be sealed.

According to the method for manufacturing a rare gas discharge lamp according to the present embodiment described above, since the annular seal member is disposed between the rare gas discharge lamp and the cylindrical body, both axes can be easily aligned. In addition, since the displacement is prevented, the cap can be attached with good workability.
Furthermore, since the sealing member is arranged between the rare gas discharge lamp and the cylinder, when molding the insulating filler for the cap, the insulating filler is placed on the center side in the length direction of the lamp. Since it is suppressed from intruding beyond the insulating member, the insulating member does not flow excessively into the light extraction portion region to form a dark portion in the lamp, and the double tube type rare earth with good productivity and good yield is obtained. A gas discharge lamp can be provided.

Further, according to the rare gas discharge lamp of the present embodiment, when the final shape is achieved, the inner tip of the cap is in contact with the seal member, so that the lamp can be reliably placed in the translucent insulating cylinder. A fixed and reliable double tube type rare gas discharge lamp can be obtained.
Further, when the lamp is formed by forming a protective layer on the outer periphery of the translucent insulating cylinder in the translucent insulating cylinder and housing the end of the protective layer inside the cap, the protective layer is formed in the cylindrical body. It is possible to form a state where it is stably attached to the cylinder without being easily peeled off from the outer surface of the tube, and it is possible to reliably prevent debris from being scattered even if the outer tube is broken. .

Thus, according to the present invention, the cap for closing the opening of the translucent insulating cylindrical body is formed of the mold resin, so that the opening of the cylindrical body can be reliably closed and the lamp can be surely secured. A double tube type rare gas discharge lamp can be provided. In addition, even if the outer diameter of the lamp and the inner diameter of the transparent insulating cylinder are small, the cap is manufactured by molding, so the design and production are free from restrictions on the size and shape of the lamp and cylinder. It becomes possible to provide a double tube type rare gas discharge lamp having good properties.
In addition, since an annular seal member is disposed at the end of the rare gas discharge lamp and the tip inside the cap is in contact with the seal member, the resin agent constituting the cap permeates into the light extraction portion region. Therefore, a double tube type rare gas discharge lamp having desired light emission characteristics and light distribution characteristics can be obtained.
Moreover, when providing the protective layer made of resin on the outer periphery of the translucent insulating cylinder, the protective function can be further enhanced by molding the protective layer in the cap including the protective layer.

As mentioned above, although embodiment of this invention was described, it cannot be overemphasized that this invention can add a change suitably, without being limited to the above-mentioned content. For example, in the above-described embodiment, an example in which a protective layer is provided over the entire light-transmitting cylindrical body has been described, but it goes without saying that the present invention can be applied even when there is no protective layer.
In addition, the method for manufacturing a double tube lamp of the present invention is not limited to the external electrode type lamp, but can be applied to other lamps.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a perspective view of a rare gas discharge lamp, and FIG. 4B is a perspective view of a translucent insulating cylinder, illustrating an embodiment of the present invention. It is explanatory drawing which shows the mold operation process of an insulating resin agent explaining embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing in the direction which shows a part in cross section explaining embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a perspective view for explaining a structure for attaching a feeder line of a rare gas discharge lamp according to a conventional technique, and FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Noble gas discharge lamp 11 Arc tube 11A, 11B End part 12 External electrode 13 Feed line 14 Conductive adhesive 15 Phosphor layer 20 Translucent insulating cylinder 21 Seal member 22 Protective layer 30 Cap 30A Cap tip L Lamp structure MC1, MC2 Mold N Injection hole K Outlet hole S Insulating filler

Claims (4)

A rare glass comprising an elongated glass tube, a rare gas sealed in the glass tube, and a pair of electrodes, at least one of which is disposed outside the glass tube, spaced apart from each other and disposed along the tube axis of the tube. A gas discharge lamp;
The entire rare gas discharge lamp is accommodated in a substantially sealed state, and includes a translucent insulating cylinder and a cap that closes an end opening of the translucent insulating cylinder,
The cap is formed by molding using a thermoplastic resin or a thermosetting resin, including the translucent insulating cylinder and the end of the rare gas discharge lamp, and a double tube type rare gas Discharge lamp. At the end of the rare gas discharge lamp, an annular seal member is disposed in the gap between the rare gas discharge lamp and the translucent insulating cylinder,
2. The double tube type rare gas discharge lamp according to claim 1, wherein the cap is disposed outside the seal member in a length direction of the rare gas discharge lamp. A protective layer made of resin is disposed on the outer periphery of the translucent insulating cylinder,
3. The double tube type rare gas discharge lamp according to claim 1, wherein the cap accommodates an end portion of the protective layer and is attached to the translucent insulating cylinder. 4. A method of manufacturing a double-tube lamp comprising a lamp having an elongated glass tube and a translucent insulating cylinder that accommodates the lamp,
Disposing an annular sealing member at the end of the glass tube of the lamp;
Accommodating the lamp in the translucent insulating cylinder; and
And a step of forming a cap by molding using a thermoplastic resin or a thermosetting resin at the end of the structure that combines the light-transmitting insulating cylinder and the rare gas discharge lamp. To manufacture a double tube lamp.

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