JP2009277530A - Double tube type rare gas discharge lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rare gas discharge lamp on which a reflecting member can be arranged in a simple method and which has improved light emitting property by using the reflecting member having good reflective property. <P>SOLUTION: The double tube type rare gas discharge lamp includes a rare gas discharge lamp consisting of a luminous tube having a luminous layer on the inner face and filled with rare gas, and a pair of external electrodes arranged on the outer surface of the luminous tube at a mutual space along the tube axial direction of the luminous tube, and a translucent insulating cylinder body and an approximately columnar holder for storing the rare gas discharge lamp in an approximately sealed condition, the holder closing the end opening of the cylinder body. A light reflecting sheet is arranged on the outer peripheral face of the translucent insulating cylinder body, and a translucent tube as a heat shrinkable tube is mounted on the light reflecting sheet. <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 general illumination, advertisement, backlight for a signboard, etc. In particular, the rare gas discharge lamp main body has translucency. The present invention relates to a double tube type rare gas discharge lamp in a form housed in an insulating cylinder.

  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. Recently, this external electrode type rare gas discharge lamp does not use mercury, so it has a quick start-up and is suitable for use in cold regions. No. 1 discloses a rare gas discharge lamp suitable for general illumination.

The noble gas discharge lamp described in this document will be described with reference to FIG.
FIG. 5 is a view for explaining a double tube type rare gas discharge lamp according to the prior art, and is a sectional view cut in a direction perpendicular to the tube axis.
In FIG. 5, a rare gas discharge lamp 50 includes an arc tube 51 made of a glass tube, and external electrodes 52 and 52 are additionally provided. When a high frequency and high voltage such as about 1600 V at a peak voltage of 30 kHz, for example, are applied to the external electrodes 52 and 52, a dielectric barrier discharge is generated inside the arc tube 51. At that time, the xenon enclosed in the arc tube 51 is excited to generate ultraviolet light having a wavelength of 172 nm, and the ultraviolet light excites the phosphor of the light emitting layer 53 and is converted into visible light between the electrodes 52 and 52. The outside is taken out from the opening.

  The external electrode 52 is made of, for example, an aluminum strip foil. Although there are various manufacturing processes, for example, an adhesive layer is formed on such an aluminum foil, and is adhered to the outer surface of the arc tube 52.

  In this rare gas discharge lamp 50, a protective tube is not directly disposed around the arc tube 51, and a translucent insulating cylinder 60 as an outer tube is disposed so as to cover the entire lamp 50. The The light-transmitting insulating cylinder 60 is a tube made of an insulating material such as light-transmitting glass or polycarbonate and having both ends opened. When the lamp 50 is inserted into the translucent insulating cylinder 60, lid members (holders) 55 and 56 are attached to the openings at both ends by the adhesive H, and the inside is substantially sealed. As a result, the lamp 50 can block moisture and moisture from the outside.

  By the way, the external electrode 52 of such a rare gas discharge lamp 50 is often formed by using a metal or a conductive paste as described above. Since this is generally an opaque material, light is emitted. There are few areas and it is considered disadvantageous. Therefore, conventionally, the light extraction direction is limited to one of the openings between the electrodes, and the light is concentrated so that the light output from one side is increased.

For example, in Patent Document 2, in order to make the light emitted from the electrode 72 and the opening 70A of the electrode 72 formed on one side surface of the arc tube 71 as shown in FIG. A technique is disclosed in which a reflective member 73 having light reflectivity is disposed in the other opening 70B in between. By providing the reflecting member 73, the light is reflected by the reflecting surface, the amount of light emitted from the opening 70A at the facing position is increased, and the light use efficiency can be enhanced.
JP 2007-324034 A Japanese Patent Application Laid-Open No. 10-199488

However, since the reflecting member 73 described in Patent Document 2 is directly attached to the arc tube 71, it is limited to an insulating material.
That is, it is essential that the reflecting member 73 has an insulating property in order to secure the insulating property between the external electrodes facing each other. For example, the reflecting member 73 is reflective such as titanium oxide (TiO ₂ ), magnesium oxide (MgO). A transparent sheet portion corresponding to the second opening 70B, which is made of a powder having an insulating sheet, an insulating sheet coated with a reflective sheet such as titanium oxide or magnesium oxide, and foamed PET. It is applied by spraying, coating or the like, or a band-like material is disposed and bonded.

  When the powder is applied to the arc tube by spraying as described above, it is difficult to fix the powder uniformly and stably on a curved surface such as a tube. For this reason, a manufacturing process becomes complicated and there exists a problem that a yield is bad. In the case of reflection by a powder layer, reflection by diffuse reflection (irregular reflection) is used. In this case, since reflection is repeated on the surface of the particle and emitted to the outside, there is a problem that reflection loss due to repeated reflection is large and efficiency is not good.

  Therefore, the present invention can arrange a reflecting member in a rare gas discharge lamp in a simple manner, and can use a reflective member having high reflectivity characteristics to provide a rare gas discharge lamp with good light emission characteristics. The purpose is to provide.

Therefore, the rare gas discharge lamp according to the present invention includes a light emitting tube having a light emitting layer on the inner surface and filled with a rare gas inside,
A rare gas discharge lamp having a pair of external electrodes spaced apart from each other on the outer surface of the arc tube and disposed along the tube axis direction of the arc tube, and the rare gas discharge lamp are accommodated in a substantially sealed state A double-tube type rare gas discharge lamp comprising a translucent insulating cylinder and a substantially cylindrical holder that closes an end opening of the cylinder,
A light reflecting sheet is disposed on the outer peripheral surface of the light transmitting insulating cylinder, and a light transmitting tube made of a heat shrinkable tube is mounted on the light reflecting sheet.
The light reflecting sheet is disposed in one opening between the external electrodes and extends in the tube axis direction of the translucent insulating cylinder.
The translucent tube is disposed over substantially the entire length of the end portion of the translucent insulating cylinder, and the end portion of the translucent tube is accommodated in the holder. To do.

  According to the present invention, it is possible to provide a rare gas discharge lamp which can form a reflection surface by a metal reflection surface, realize high-efficiency reflection, and has a simple configuration and high mass productivity. Can do.

Hereinafter, embodiments of the present application will be described with reference to FIGS.
FIG. 1 is an explanatory view showing the entire double tube type rare gas discharge lamp according to the present invention in a partial cross section, and FIG. 2 shows the double tube type rare gas discharge lamp in a direction perpendicular to the tube axis of the lamp. It is sectional drawing cut | disconnected. 3 and 4 are explanatory views for explaining a method for manufacturing a rare gas discharge lamp according to the present invention, and FIG. 3 shows (a) a perspective view and (b) a tube shaft in which a rare gas discharge lamp body is taken out. It is sectional drawing cut | disconnected in the perpendicular direction. 4A is a perspective view of the translucent insulating cylinder, and FIG. 4B is a cross-sectional view cut in a direction perpendicular to the tube axis.

1 to 3, the arc tube 11 of the rare gas discharge lamp 10 is made of a glass tube that is a translucent dielectric, and a phosphor is applied to the inside of the inner surface over the entire circumference so that the phosphor layer 15 is formed. In addition to being formed, a rare gas containing xenon gas as a main VUV light emitting element is sealed and hermetically sealed in a light emitting tube 11 of a glass tube.
A pair of conductive external electrodes 12 and 12 are separated from each other on the outer surface of the arc tube 11 and are disposed in the axial direction of the tube, whereby the rare gas discharge lamp 10 is configured. 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 11 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 a connecting means such as a conductive adhesive 14.
Specifically, the power supply line 13 is formed by covering a plurality of metal strands (thin wires) with a coating material having electrical insulation such as silicon. A plate-like crushing portion 13A formed by plastic deformation of a metal by crushing a bundle of strands exposed from the covering material is formed at the connection side end portion of the external electrode 12 in the feeder 13. The conductive adhesive 14 is applied to the wide surface of the crushing portion 13A and attached to the external electrode 12.

  As shown in FIG. 1, a translucent insulating cylinder 20 is provided around the rare gas discharge lamp 10 to form an outer bulb having a length longer than the entire length of the arc tube 11. On the outer peripheral surface of the translucent insulating cylinder 20, a translucent tube 22 is attached on the outer peripheral surface over the entire length in the length direction of the tube, and the translucent tube 22 and the translucent insulating cylindrical body 20. In the meantime, as shown in the cross-sectional view of FIG.

The light reflecting sheet 23 is formed with a glossy metal reflecting surface 23A on one surface of the translucent insulating cylinder 20, and specifically, for example, a metal such as aluminum, silver, or gold is formed into a plate or foil. For example, or a sheet formed by coating a resin layer on a resin sheet or by bonding a resin sheet and a metal foil.
Such a light reflecting sheet 23 is formed in a ribbon shape in accordance with the dimensions of the translucent insulating cylinder 20, and is attached so that the metal reflecting surface 23A is in close contact with the outer surface of the translucent insulating cylinder 20. The And the translucent tube 22 attached on the outer peripheral surface is being fixed on the outer peripheral surface of the translucent insulating cylinder 20 with the force which urges | biases this to a center direction.
One translucent tube 22 is composed of a shrink tube, specifically made of a resin such as polyolefin or polyvinyl chloride, having a thickness of 0.07 to 0.1 mm and a shrinkage temperature of 100. The thing of -150 degreeC is suitable.

  The light reflecting sheet 23 is disposed along one opening 11B between the external electrodes 12, and reflects light emitted from the opening 11B toward the opening 11A. When the reflected light passes through the light emitting tube 11 and the light emitting layer 13, it passes through the discharge space, passes through the light emitting layer 15 and the light emitting tube 11 facing each other, passes through the other opening 11A between the external electrodes, and goes outside the lamp. Then, the light is further emitted through the layers of the light-transmitting insulating cylinder 20 and the light-transmitting tube 22. As a result, the reflected light is superimposed on the light directly emitted to the outside from the other opening side of the rare gas discharge lamp 10, and a large light output can be obtained.

  According to such a rare gas discharge lamp according to the present invention, since the reflection surface is constituted by the metal reflection surface, a highly directional reflection occurs in accordance with the law of reflection, and the outer surface of the translucent insulating cylindrical body Therefore, the light can be refracted in a predetermined direction with almost one reflection. Therefore, the reflection loss can be sufficiently suppressed as compared with the case of irregular reflection of the prior art, and an efficient rare gas discharge lamp can be provided.

  In this rare gas discharge lamp, as shown in FIG. 1, a holder 21 that closes the opening in a substantially sealed state is attached to the end openings 20 a and 20 b of the translucent insulating cylinder 20. The holder 21 is formed by molding a resin material made of an insulating thermoplastic material such as silicone or urethane, and the arc tube of the rare gas discharge lamp 10 is formed inside the translucent insulating cylinder 20. The end 11b is fixed in a supported state (only one side 11b is shown in FIG. 1, but the other end 11a is similarly held). A power supply line 13 is led out from a power supply side end of the rare gas discharge lamp 10 through a holder 21.

  Such a holder 21 is preferably mounted including the end portion of the translucent tube 22 as shown in FIG. 1, and according to such a configuration, the translucent tube 22 is translucent insulating cylinder. This is advantageous because the reflecting sheet 23 can be reliably fixed without being easily peeled off from the body 20. In the unlikely event that the lamp 10 or the cylinder 20 itself is damaged, the translucent tube 22 is closed by the holder 21, so that the lamp can be handled safely and easily without scattering the fragments inside. It becomes like this.

Here, with reference to FIGS. 1-4, the manufacturing method of the double tube | pipe type noble gas discharge lamp based on this invention is demonstrated based on an Example.
<Example>
FIG. 3 is a perspective view of the rare gas discharge lamp 10 and a cross-sectional view taken along the line MM. The rare gas discharge lamp 10 has, for example, an external electrode 12 made of a silver paste having a total length of 1000 mm, an outer diameter of the arc tube of 15 mm, an inner diameter of 13 mm, and a width of 1 mm and a length of 970 mm on the outer surface of the arc tube 11. Is arranged. First, a sealing material 16 made of an O-ring is attached to the rare gas discharge lamp 10 in the vicinity of the end portions 11a and 11b. Other than the O-ring, the sealing material 16 may be another member as long as it has a predetermined thickness over the entire circumference and has insulating properties.

Subsequently, as shown in FIG. 4A, a substantially strip-shaped light reflecting sheet 23 is applied and temporarily attached to the outer surface of the translucent insulating cylinder 20. The light reflecting sheet 23 has a metal reflecting surface formed by forming a deposited film of gold and silver on a resin base material such as polypropylene, and has a ribbon shape having a length of 970 mm, a width of 20 mm, and a thickness of 10 μm. is there.
The cylindrical body structure in this state is inserted into the translucent shrink tube S cut to a predetermined length. The shrink tube S is made of polyolefin and has a shrinkage temperature of about 120 ° C. When heated to a temperature of 120 to 150 ° C. by using a heating device (not shown) from the outside, the shrink tube S contracts and comes into close contact with the translucent insulating cylinder 20 as shown in FIG. The conductive tube 22 is attached to the translucent insulating cylinder 20. As a result, the light reflecting sheet 23 is pressed against the light transmissive tube 22 and is in close contact with the light transmissive insulating cylinder 20, and the light transmissive insulating cylinder 20 having the metal reflecting surface 23A is completed.

  Subsequently, the rare gas discharge lamp 10 is inserted into the translucent insulating cylinder 20 so that the position of the light reflecting sheet 23 and the position of one opening between the external electrodes 12 coincide with each other, and the lamp 10 is centered. The inside of the translucent insulating cylinder 20 is held by the sealing material 16.

The lamp 10 and the translucent insulating structure 20 in this state are fitted into a holder molding die (not shown) and a resin material is molded. At this time, after the resin material for molding is solidified by filling with no gap so as to contact the sealing material 16 disposed on the outer periphery of the rare gas discharge lamp 10 as shown in FIG. The part 11b is supported in a hollow manner in the translucent insulating cylinder 20 by the holder 21. Further, since the holder 21 is formed including the end portion of the translucent tube 22, the translucent tube 22 is hardly peeled off, and the light reflecting sheet 23 can be stably attached.
In this way, the double tube type rare gas discharge in which both end portions of the translucent insulating cylinder 20 are closed in a substantially sealed state and the rare gas discharge lamp 10 is supported inside the translucent insulating cylinder 20. Make a lamp.

When the light reflecting sheet is attached by the shrinking force of the shrink tube as described above, the light reflecting sheet is pressed in the center direction of the cylindrical body and is firmly fixed on the outer peripheral surface. A seat can be attached.
In addition, since the light reflecting sheet is disposed on the outer surface of the translucent insulating cylindrical body, it is possible to reliably ensure insulation from the external electrode, so that a metal reflecting surface that could not be used conventionally is used. In addition, since it is a reflection with less reflection loss compared to the conventional diffuse reflection (diffuse reflection), a larger light output can be obtained.
Furthermore, since the shrink tube is arranged on the outer peripheral surface of the translucent insulating cylindrical body, it can function to prevent fragments from being scattered even if the lamp or the cylindrical body itself is damaged. Since the end of the conductive tube is accommodated inside the holder, the tube is difficult to peel off, and the light reflecting sheet can be stably fixed.

  According to the present invention described above, the light reflecting sheet having the metal reflecting surface is arranged around the translucent insulating cylinder, and the light reflecting sheet is pressed in the center direction by the shrink tube. Even in the case of the reflective member, the discharge generated between the electrodes is not obstructed, so that a stable discharge can be performed and a high reflection efficiency can be realized.

As described above, according to the present invention, it is possible to obtain a good connection state between the power supply line and the external electrode while having a simple configuration, and it is possible to manufacture a rare gas discharge lamp with high mass productivity.
As mentioned above, although various things were described about embodiment of this invention, it cannot be overemphasized that a various change can be added for this invention, without being limited to the said structure.

It is a figure of the double tube | pipe type noble gas discharge lamp concerning embodiment of this invention, and is an explanatory side view which shows a part in cross section. It is sectional drawing which cut | disconnected the double tube | pipe type noble gas discharge lamp concerning embodiment of this invention in the orthogonal | vertical direction with respect to the tube axis | shaft of a lamp | ramp. It is (a) perspective view and (b) sectional drawing of the noble gas discharge lamp explaining the Example of this invention. It is the (a) perspective view of the translucent insulating cylinder explaining the Example of this invention, and (b) sectional drawing. It is a figure explaining the double tube | pipe type noble gas discharge lamp concerning a prior art, and is sectional drawing cut | disconnected in the direction perpendicular | vertical to a tube axis | shaft. It is explanatory drawing of the noble gas discharge lamp which concerns on another prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Noble gas discharge lamp 11 Arc tube 11a End part 11b End part 11A Open part 11B Open part 12 External electrode 13 Feed line 13A Crushing part 14 Conductive adhesive 15 Light emitting layer 16 Sealing material 20 Translucent insulating cylinder 21 Holder 22 Translucent tube 23 Light reflecting sheet 23A Metal reflecting surface S Shrink tube

Claims (3)

An arc tube having a light emitting layer on the inner surface and filled with a rare gas inside;
A rare gas discharge lamp comprising a pair of external electrodes spaced apart from each other on the outer surface of the arc tube and disposed along the tube axis direction of the arc tube;
The rare gas discharge lamp is housed in a substantially hermetically sealed state, a translucent insulating cylinder and a substantially cylindrical holder that closes the end opening of the cylinder,
A double tube type rare gas discharge lamp comprising:
A double-tube type rare earth, characterized in that a light-reflecting sheet is disposed on the outer peripheral surface of the light-transmitting insulating cylinder, and a light-transmitting tube made of a heat-shrinkable tube is mounted on the light-reflecting sheet. Gas discharge lamp.
2. The double tube type rare gas discharge according to claim 1, wherein the light reflecting sheet is disposed in one opening between the external electrodes and extends in a tube axis direction of the translucent insulating cylindrical body. lamp.
The translucent tube is arranged over substantially the entire length of the end of the translucent insulating cylinder, and the end of the translucent tube is accommodated in the holder. Item 3. The double tube type rare gas discharge lamp according to Item 1 or 2.

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